New and Changed Features
This section describes the new features and enhancements to existing features in Junos OS Release 17.4R2 for the PTX Series.
Release 17.4R2 New and Changed Features
There are no new features or enhancements to existing features for PTX Series in Junos OS Release 17.4R2.
Release 17.4R1 New and Changed Features
PTX10016 Packet Transport Router—Starting in Junos OS Release 17.4R1, the PTX10016 Packet Transport Router provides 3.0 Tbps per slot forwarding capacity for the service providers and cloud operators. The router provides an opportunity for the cloud, telco, and data center operators for a smooth transition from 10-Gigabit Ethernet and 40-Gigabit networks to 100-Gigabit Ethernet high-performance networks. This high-performance, 21 rack unit (21RU) modular chassis provides 48 Tbps of throughput and 32 Bpps of forwarding capacity. The PTX10016 router has 16 slots for the line cards that can support a maximum of 2304 10-Gigabit Ethernet ports, 576 40-Gigabit Ethernet ports, or 480 100-Gigabit Ethernet ports.
You can deploy the PTX10016 router in the core of the network for the following functions:
Label switching routing
IP core routing
PTX10016 Packet Transport Router supports two PTX10K line cards, LC1101 and LC1102. The LC1101 line card consists of thirty QSFP+ Pluggable Solution (QSFP28) cages that support 40-Gigabit Ethernet or 100-Gigabit Ethernet optical transceivers. The line card supports speed of either 40-Gbps or 100-Gbps. It also supports 10-Gigabit Ethernet by channelizing the 40-Gigabit Ethernet ports. The default port speed is 100-Gbps. The default port speed is 100-Gbps. If the user plugs in 40Gigabit or 4x10Gigabit optic, the appropriate port speed has to be configured manually.
The LC1102 line card consists of 36 quad small form-factor pluggable plus (QSFP+) ports that support 40-Gigabit Ethernet optical transceivers. The QSFP+ ports support 40-Gigabit or 100-Gigabit Ethernet optical transceivers in selected ports. The default port speed on the LC1102 line card is channelized 10-Gbps. Out of these 36 ports, 12 ports are QSFP28 capable for supporting 100-Gigabit Ethernet. The line card supports 10-Gigabit Ethernet by channelizing the 40-Gigabit ports. Channelization is supported on fiber breakout cable using standard structured cabling techniques.
For more information, see PTX10016 Packet Transport Router Hardware Guide .
Support for the CFP2-DCO-T-WDM-1 transceiver on the P2-100GE-OTN PIC (PTX)—Starting in Junos OS Release 17.4R1, you can install the CFP2-DCO-T-WDM-1 transceiver on the P2-100GE-OTN PIC. The CFP2-DCO-T-WDM-1 transceiver is a 100-Gigabit digital pluggable CFP2 digital coherent optical module.
The CFP2-DCO-T-WDM-1 transceiver supports the following:
International Telecommunication Standardization(ITU-T) OTN performance monitoring and alarm management
100-Gigabit Ethernet quadrature phase shift keying (QPSK) with differential encoding mode and soft-decision forward error correction (SD-FEC)
proNX Service Manager (PSM)
Junos OS YANG extensions
High Availability (HA) and Resiliency
Resiliency Support for PTX10K-LC1101 and PTX10K-LC1102 (PTX10016)—Starting with Junos OS Release 17.4R1, resiliency support is enabled for the following components:
PTX10K-LC1101 and PTX10K-LC1102
Routing and Control Boards
Switch Interface Boards
Interfaces and Chassis
Fabric Management Support (PTX100016)—Starting in Junos OS Release 17.4R1, you can set up and manage the fabric connections between the Packet Forwarding Engines in the PTX100016 routers. Fabric management includes collecting fabric status and statistics, monitoring health of the hardware, and responding to CLI queries. It also tracks addition and removal of FRUs from the router and monitors faults in the data plane. It is enabled by default and can be monitored by using the following commands:
show chassis fabric summary
show chassis fabric fpcs fpc fpc-slot
show chassis fabric sibs
show chassis fabric errors
show chassis fabric reachability
[See Fabric Management Overview.]
Support for large-scale packet-forwarding features (PTX10000)—Starting with Junos OS Release 17.4R1, PTX10000 router supports large scaling IPv4 and IPv6 forwarding information base (FIB). A maximum of 4 million routes are supported.
Support for pre-FEC BER monitoring when using the CFP2-DCO-T-WDM-1 transceiver (PTX Series)—Starting in Junos OS Release 17.4R1, you can monitor the condition of an OTN link by using the pre-forward error correction (pre-FEC) bit error rate (BER) when using the CFP2-DCO-T-WDM-1 transceiver.
Support for a 16 Slot Chassis (PTX10016)—Starting with Junos OS Release 17.4R1, the PTX10016 has 16 slots and supports core and edge profiles.
Support for IPv6 statistics on PTX Series routers—Starting in Junos OS Release 17.4R1, you can obtain the transit IPv6 statistics at both the physical interface and logical interface levels on third-generation FPCs (FPC3-PTX-U2 and FPC3-PTX-U3 on PTX5000 and FPC3-SFF-PTX-U0 and FPC3-SFF-PTX-U1 on PTX3000), PTX1000, and PTX10008 by using both a CLI command and SNMP MIB counters. Use the show interfaces statistics command to display both physical interface and logical interface statistics. You can view only logical interface statistics if you use SNMP MIB counters. However, for aggregated Ethernet interfaces, the accounting is not done at the level of the child links and, thus, IPv6 statistics for child links are not displayed.
To start getting IPv6 statistics on third-generation FPCs, use the route-accounting statement at the [edit forwarding-options family inet6] hierarchy level. PTX Series routers with first-generation and second-generation FPCs do not display IPv6 statistics for physical interfaces or logical interfaces, and transit statistics on child links in aggregated Ethernet interfaces are also not taken into account.
Egress accounting for IPV6 traffic is not performed for cases where MPLS packets arrives on TCC interface and egress out of the router as IPV6 packets.
Junos OS XML API and Scripting
Automation script library additions and upgrades (PTX Series)—Starting in Junos OS Release 17.4R1, devices running Junos OS include new and upgraded Python modules as well as upgraded versions of Junos PyEZ and libslax. On-box Python automation scripts can use features supported in Junos PyEZ Release 2.1.4 and earlier releases to perform operational and configuration tasks on devices running Junos OS. Python automation scripts can also leverage new on-box Python modules including
six, as well as upgraded versions of existing modules. In addition, SLAX automation scripts can include features supported in libslax release 0.22.0 and earlier releases.
Layer 2 Features
Support for Layer 2 protocols (PTX 10016)—Starting in Junos OS Release 17.4R1, Layer 2 protocols are supported on PTX10016 routers that have third-generation FPCs installed. Layer 2 protocols include Spanning Tree Protocol (STP), Rapid Spanning Tree Protocol (RSTP), Multiple Spanning Tree Protocol (MSTP), VLAN Spanning Tree Protocol (VSTP), Link Layer Discovery Protocol (LLDP), and so on.
Layer 3 Features
Support for Layer 3 protocols (PTX 10016)—Starting in Junos OS Release 17.4R1, Layer 3 protocols are supported on PTX10016 routers that have third-generation FPCs installed. Layer 3 protocols include the Multiprotocol Label Switching (MPLS), Layer 3 Virtual Private Network (L3VPN), Bidirectional Forwarding Detection (BFD), Layer 2 Virtual Private Network (L2VPN), Point-to-multipoint (P2MP), Fast ReRoute (FRR), Operations, Administration and Maintenance (OAM), Protocol Independent Multicast (PIM), Internet Group Management Protocol (IGMP), Adaptive Load Balancing (ALB), and so on.
Support for multiple, smaller configuration YANG modules (PTX Series)—Starting in Junos OS Release 17.4R1, the YANG module for the Junos OS configuration schema is split into a root configuration module that is augmented by multiple, smaller modules. The root configuration module comprises the top-level configuration node and any nodes that are not emitted as separate modules. Separate, smaller modules augment the root configuration module for the different configuration statement hierarchies. Smaller configuration modules enable YANG tools and utilities to more quickly and efficiently compile and work with the modules, because they only need to import the modules required for the current operation.
Support for IS-IS sensor for Junos Telemetry Interface (PTX Series)—Starting with Junos OS Release 17.4R1, you can export data for the IS-IS routing protocol through the Junos Telemetry Interface. Only gRPC streaming is supported. To export statistics for IS-IS, include the/network-instances/network-instance[name_'instance-name']/protocols/protocol/isis/levels/level/ and /network-instances/network-instance[name_'instance-name']/protocols/protocol/isis/interfaces/interface/levels/level/ set of paths. Use the telemetrySubscribe RPC to specify telemetry parameters and provision the sensor. Streaming telemetry data through gRPC also requires you to download the OpenConfig for Junos OS module.
Support for Packet Forwarding Engine traffic sensor for Junos Telemetry Interface (PTX Series)—Starting with Junos OS Release 17.4R1, you can export Packet Forwarding Engine traffic statistics through the Junos Telemetry Interface. Both UDP and gRPC are supported. This sensor tracks reporting of Packet Forwarding Engine statistics counters and provides visibility into Packet Forwarding Engine error and drop statistics. The resource name for the sensor is /junos/system/linecard/packet/usage/. The OpenConfig path is /components/component/subcomponents/subcomponent[name='FPC<id>:NPU<id>']/properties/property/, where NPU refers to the Packet Forwarding Engine. To provision the sensor to export data through gRPC, use the telemetrySubcribe RPC to specify telemetry parameters. For streaming through UDP, all parameters are configured at the [edit services analytics] hierarchy level.
Enhancements to LSP events sensor for Junos Telemetry Interface (PTX Series)—Starting with Junos OS Release 17.4R1, telemetry data streamed through gRPC for LSP events and properties is reported separately for each routing instance. To export data for LSP events and properties, you must now include /network-instances/network-instance[name_'instance-name']/ in front of all supported paths. For example, to export LSP events for RSVP Signaling protocol attributes, use the following path: /network-instances/network-instance[name_'instance-name']/mpls/signaling-protocols/rsvp-te/. Use the telemetrySubscribe RPC to specify telemetry parameters and provision the sensor. If your device is running a version of Junos OS with an upgraded FreeBSD kernel, you must download the Junos Network Agent software package, which provides the interfaces to manage gRPC subscriptions.
[See Guidelines for gRPC Sensors.]
Enhancement to BGP sensor for Junos Telemetry Interface (PTX Series)—Starting with Junos OS Release 17.4R1, you can specify to export the number of BGP peers in a BGP group for telemetry data exported through gRPC. To export the number of BGP peers for a group, use the following OpenConfig path: /network-instances/network-instance[name_'instance-name']/protocols/protocol/
bgp/peer-groups/peer-group[name_'peer-group-name]/state/peer-count/. The BGP peer count value exported reflects the number of peering sessions in a group. For example, for a BGP group with two devices, the peer count reported is 1 (one) because each group member has one peer. To provision the sensor to export data through gRPC, use the telemetrySubcribe RPC to specify telemetry parameters.
[See Guidelines for gRPC Sensors.]
Support for bypass LSP statistics for Junos Telemetry Interface (PTX Series)—Starting with Junos OS Release 17.4R1, you can export statistics for bypass label-switched paths (LSPs). Previously, only statistics for the primary LSP path were exported. The ability to export bypass LSP statistics helps to monitor the efficiency of global convergence when the bypass LSP is used to carry traffic during a link or node failure.
Statistics are exported for the following:
Bypass LSP originating at the ingress router of the protected LSP
Bypass LSP originating at the transit router of the protected LSP
Bypass LSP protecting the transit LSP as well as the locally originated LSP
When the bypass LSP is active, traffic is exported both on the bypass LSP and the ingress (protected) LSP. To provision the sensor to export data through gRPC, use the telemetrySubcribe RPC to specify telemetry parameters. For streaming through UDP, all parameters are configured at the [edit services analytics] hierarchy level. Streaming telemetry data through gRPC also requires you to download the OpenConfig for Junos OS module. You must also include the sensor-based-stats statement at the [edit protocols mpls] hierarchy level.
Support for BGP routing table sensors for Junos Telemetry Interface (PTX Series)—Starting with Junos OS Release 17.4R1, you can provision Junos Telemetry Interface sensors to export data for BGP routing tables (RIBs) for IPv4 and IPv6 routes. Each address family supports exporting data for five different tables. Only gRPC streaming is supported.
The tables are:
local-rib—Main BGP routing table for the main routing instance.
adj-rib-in-pre—NLRI updates received from the neighbor before any local input policy filters have been applied.
adj-rib-in-post—Routes received from the neighbor eligible for best-path selection after local input policy filters have been applied.
adj-rib-out-pre—Routes eligible for advertising to the neighbor before output policy filters have been applied.
adj-rib-out-post—Routes eligible for advertising to the neighbor after output policy filters have been applied.
To stream data for the main BGP routing table for IPv4 routes, include the /bgp-rib/afi-safis/afi-safi/ipv4-unicast/loc-rib/ set of paths. To stream data for the main BGP routing table for IPv6 routes, include the /bgp-rib/afi-safis/afi-safi/ipv6-unicast/loc-rib/ set of paths.
For the neighbor BGP routing tables for IPv4 routes, include the following sets of paths:
To stream data for IPv6 routes change ipv4-unicast ipv6-unicast in any of the paths.
[See Guidelines for gRPC Sensors].
Support for bidirectional authentication for gRPC for Junos Telemetry Interface (PTX Series)—Starting with Junos OS Release 17.4R1, you can configure gRPC to require client authentication as well as server authentication. Previously, only the client initiating an RPC request was able to authenticate the server, that is, Juniper device, using SSL certificates. To enable bidirectional authentication, include the mutual-authentication statement at the [edit system-services extension-service request-response grpc ssl] hierarchy level. You must also configure and reference a certificate-authority profile. Include the certificate-authority profile name statement at the [edit system services extension-service request-response grpc ssl] hierarchy level. For profile-name, include the name of certificate-authority profile configured at the [edit security pki ca-profile] hierarchy level. This profile is used to validate the certificate provided by the client.
Enhancements to MPLS sensor for Junos Telemetry Interface (PTX Series)—Starting with Junos OS Release 17.4R1, you can export statistics for MPLS through the Junos Telemetry Interface in the following categories:
Shared Risk Link Groups (SRLGs)
Traffic engineering global attributes
Traffic engineering interface attributes
Additional RSVP Signaling Protocol attributes, such as counters and interfaces, that were not previously available are also supported. Only gRPC streaming is supported.
[See Guidelines for gRPC Sensors.]
FPC1 and FPC2 support for CPU and NPU sensors for Junos Telemetry Interface (PTX Series)—Starting with Junos OS Release 17.4R1, you can export data for CPU memory and NPU memory and utilization for FPC1 and FPC2 on PTX Series routers through the Junos Telemetry Interface. Previously, only FPC3 was supported on these sensors. To provision the sensor to export data through gRPC, use the telemetrySubscribe RPC to specify telemetry parameters. For streaming through UDP, all parameters are configured at the [edit services analytics] hierarchy level. Streaming telemetry data through gRPC also requires you to download the OpenConfig for Junos OS module.
Support for static adjacency segment identifier for aggregate Ethernet member links using single-hop static LSP (PTX Series)—Starting with Junos OS Release 17.4R1, you can configure a transit single-hop static label switched path (LSP) for a specific member link of an aggregate Ethernet (AE) interface. A static labeled route is added with next-hop pointing to the AE member link of an aggregate interface. Label for these routes is picked from the segment routing local block (SRLB) pool of the configured static label range. This feature is supported for AE interfaces only.
A new member-interface CLI command is added under the next-hop configuration at the [edit protocols mpls static-label-switched-path lsp-name transit] hierarchy to configure the AE member interface name. The static LSP label is configured from a defined static label range.
Support for static adjacency segment identifier for IS-IS (PTX Series)—Starting with Junos OS Release 17.4R1, you can configure static adjacency segment ID (SID) labels for an interface. You can configure two IPv4 adjacency SIDs (protected and unprotected), IPv6 adjacency SIDs (protected and unprotected) per level per interface. You can use the same adjacent SID for multiple interfaces by grouping a set of interfaces under an interface-group and configuring the adjacency-segment for that interface-group. For static adjacency SIDs, the labels are picked from either a static reserved label pool or from segment routing global block (SRGB).
Support for adjusting the threshold of autobandwidth based on the absolute value for LSP (MX Series)—Current autobandwidth threshold adjustment is done based on the configured percentage, which is hard to tune to work well for both small and large bandwidth reservations. For a given threshold percentage, when the bandwidth reservation is small there can be multiple LSP resignalling events. This is because the LSP is responsive to even minor increase or decrease in the utilization when current reservation is small. For example, a small threshold adjustment of 5 percent allows large LSPs of say 1G to respond to changes in bandwidth of the order of 50M. However, that same threshold adjustment results in too many LSP resignalling events for small LSPs of say 10M reservation. Increasing the adjust threshold percentage by for example 40 percent minimizes LSP resignaling for small LSPs. However, large LSPs do not react to bandwidth usage changes unless they are huge, for example, 400M. Starting in Junos OS Release 17.4R1, you can configure an absolute value based threshold along with the percentage based threshold that helps avoid the bandwidth getting triggered for LSPs of both small and large bandwidth reservations. Configure adjust-threshold-absolute value option at the [edit protocols mpls label-switched-path lsp-name auto-bandwidth] hierarchy level.
Support for default time-out duration for self-ping on an LSP instance (PTX Series)—Starting in Junos OS 17.4R1, the default time out duration for which the self-ping runs on an LSP instance is reduced from 65535 (runs until success) to 1800 seconds. You can also configure the self ping duration value between 1 to 65,535 (runs until success) seconds using the self-ping-duration value command at the [edit protocols mpls label-switched-path label-switched-path] hierarchy level. By default, self-ping is enabled. The LSP types like CCC, P2MP, VLAN-based, and non-default instances do not support self-ping . You can configure no-self-ping command at the [edit protocols mpls label-switched-path label-switched-path] hierarchy level to override the behavior of self-ping running by default.
Support for flap and MBB counter for LSP (PTX Series)—Starting in Junos OS Release 17.4R1, the show mpls lsp extensive command introduces the following two counters for LSP on master routing engine only:
Flap counter–- Counts the number of times an LSP flaps down or up.
MBB counter— Counts the number of times an LSP incurs MBB.
The clear mpls lsp counters command resets the flap and the MBB counter to zero.
Display of labels in received record route for unprotected LSPs by show mpls lsp extensive command (PTX Series)—The show mpls lsp extensive command displays the labels in received record route (RRO) for protected LSPs. Starting in Junos OS Release 17.4R1, the command also displays the labels associated with the hops in RRO for unprotected LSPs as well. The label recording in RRO is enabled by default.
Support for label history for MPLS protocol (PTX Series)—Starting in Junos OS Release 17.4R1, configure max-entries number option at [edit protocols mpls label-history] hierarchy level to display label allocation, release history, and associated information such as RSVP session that helps debug label related error such as stale label route and deleted label route. You can configure the limit for the maximum number of MPLS history entry per label . By default, label history is off and there is no maximum limit for the number of entries for each label. The show mpls label history label-value command displays the label history for a given label value and the show mpls label history label-range start-label end-label command displays the history of labels between the given label range.
The clear mpls label history command clears the label history details.
Support for importing IGP topology information into BGP-LS (PTX Series)—Starting in Junos OS Release 17.4R1, you can import interior gateway protocol (IGP) topology information into BGP-Link State (BGP-LS) in addition to RSVP-traffic engineering (RSVP-TE) topology information through the lsdist.0 routing table. This allows you to monitor both IGP and traffic engineering topology information.
To install IGP topology information into the traffic engineering database, use the set igp-topology configuration statement at the [edit protocols isis traffic-engineering] and [edit protocols ospf traffic-engineering] hierarchy levels. To import IGP topology information into BGP-LS from lsdist.0, use the set bgp-ls configuration statement at the [edit protocols mpls traffic-engineering database import igp-topology] hierarchy level.
BGP supports segment routing policy for traffic engineering (PTX Series)—Starting in Junos OS Release 17.4R1, a BGP speaker supports traffic steering based on a segment routing policy. The controller can specify a segment routing policy consisting of multiple paths to steer labeled or IP traffic. This feature enables BGP to support a segment routing policy for traffic engineering at ingress routers. The segment routing policy adds an ordered list of segments to the header of a packet for traffic steering. Static policies can be configured at ingress routers to allow routing of traffic even when the link to the controller fails.
To enable BGP IPv4 segment routing traffic engineering capability for an address-family, include the segment-routing-te statement at the [edit protocols bgp family inet] hierarchy level.
Topology-independent loop-free alternate for IS-IS (PTX Series)—Starting in Junos OS Release 17.4R1, topology-independent loop-free alternate (TI-LFA) with segment routing provides MPLS fast reroute (FRR) backup paths corresponding to the post-convergence path for a given failure. You can enable TI-LFA for IS-IS by configuring the use-post-convergence-lfa statement at the [edit protocols isis backup-spf-options] hierarchy level. TI-LFA provides protection against link failure, node failure, and failures of fate-sharing groups.
You can enable the creation of post-convergence backup paths for a given interface by configuring the post-convergence-lfa statement at the [edit protocols isis interface interface-name level level] hierarchy level. The post-convergence-lfa statement enables link-protection mode.
You can enable node-protection and/or fate-sharing-protection mode for a given interface at the [edit protocols isis interface interface-name level level post-convergence-lfa] hierarchy level. To use a particular fate-sharing group as a constraint for the fate-sharing-aware post-convergence path, you need to configure the use-for-post-convergence-lfa statement at the [edit routing-options fate-sharing group group-name] hierarchy level.
Support for network instance-based BGP configuration (PTX Series)—Starting in Junos OS Release 17.4R1, you can configure BGP in a specific network instance. After the network instance is configured, you will be prompted with options for BGP configuration such as global bgp, neighbor bgp, and so on.
DDoS protection support (PTX3000, PTX-5000, PTX1000, PTX10000)—Starting with Junos OS Release 17.4R1, protection from DDoS attack is provided on PTX3000, PTX 5000, PTX1000, and PTX10000 routers only if they have PE-based FPCs installed.
If the total amount of traffic that a Routing Engine can handle exceeds its limit, the Routing Engine becomes overloaded and is unable to handle the routing protocol messages and other important control plane packets. This results in an inconsistent control plane protocol state and that is termed as DDoS attack.
With the support for DDoS protection, the firewall filters and policers available in Junos OS are used to discard or rate-limit control plane traffic so that such malicious traffic does not overwhelm and bring down the Routing Engine. The Packet Forwarding Engine does not support rate-based policers; therefore, DDoS protection works based on bandwidth.
DDoS protection is supported with the following protocols:
L3 protocols— IGMP v4/v6, OSPF-Hello, OSPF, LDP-Hello, LDP, PIM-Ctrl, PIM-Data, RSVP, RIP, BFD, MHOP BFD, MSDP, BGP, TELNET, FTP, SSH, SNMP, NTP, TACACS, DNS, GRE, ICMP, MLD, NDP, and EGPv6
L2 protocols— STP, LACP, LLDP, OAM-CFM, OAM-LFM, ISIS, ISO-TCC, ETH-TCC, and PVST
Exceptions to DDoS protection support include the following:
L3 protocols are per protocol level and not at packet type level.
Unsupported L3 protocols— DHCP v4/v6, PTP, VRRP, DTCP, RADIUS-SERVER, RADIUS-ACCT, RADIUS-AUTH, DIAMETER, DIAMETER-TCP, DIAMETER-SCTP, L2TP, LMP, BFDv6, Martian-address, and PIM-REGISTER
Unsupported L2 protocols— STP, DOT1X, GARP, FC, Bridge control, and PVST
FPC1 and FPC2 on PTX5000 router are not supported.
For more information, see Distributed Denial-of-Service (DDoS) Protection Overview.
Support for EBGP route server (PTX Series)—Starting in Junos OS Release 17.4R1, BGP feature is enhanced to support EBGP route server functionality. A BGP route server is the external BGP (EBGP) equivalent of an internal IBGP (IBGP) route reflector that simplifies the number of direct point-to-point EBGP sessions required in a network. EBGP route server propagates unmodified BGP routing information between external BGP peers to facilitate high scale exchange of routes in peering points such as Internet Exchange Points (IXPs). When BGP is configured as a route server, EBGP routes are propagated between peers unmodified, with full attribute transparency (NEXT_HOP, AS_PATH, MULTI_EXIT_DISC, AIGP, and Communities).
The BGP JET bgp_route_service.proto API has been enhanced to support route server functionality as follows:
Program the EBGP route server.
Inject routes to the specific route server RIB for selectively advertising it to the client groups in client-specific RIBs.
The BGP JET bgp_route_service.proto API includes a peer-type object that identifies individual routes as either EBGP or IBGP (default).
[See BGP Route Server Overview.]
Support for BGP advertising aggregate bandwidth across external BGP links for load balancing (MX Series)—Starting in Junos OS Release 17.4R1, BGP uses a new link bandwidth extended community, aggregate-bandwidth, to advertise aggregated bandwidth of multipath routes across external links. BGP calculates the aggregate of multipaths that have unequal bandwidth allocation and advertises the aggregated bandwidth to external BGP peers. A threshold to the aggregate bandwidth can be configured to restrict the bandwidth usage of a BGP group. In earlier Junos OS releases, a BGP speaker receiving multipaths from its internal peers advertised the link bandwidth associated with the active route. To advertise aggregated bandwidth of multipath routes and to set a maximum threshold, configure a policy with aggregate-bandwidth and limit bandwidth actions at the [edit policy-options policy-statement name then] hierarchy level.
Support for Layer 2 circuit pass-through (PTX Series)—Starting in Junos OS Release 17.4R1, you can configure PTX Series routers to allow LACP, LLDP, OAM LFM, and OAM CFM packets to cross the Layer 2 circuit. To configure Layer 2 circuit pass-through, include the l2circuit-control-passthrough statement at the [set forwarding-options] hierarchy level.
LACP can be configured only when the aggregated interface is configured with the ethernet-ccc encapsulation.
Reporting of true outgoing interface packets for inline flow monitoring (PTX Series)—Starting in Junos OS Release 17.4R1, you can configure inline flow monitoring to report true packets for the outgoing interface. For ECMP, the actual outgoing interface used for a given flow is the true outgoing interface.
To enable a true outgoing interface, include the nexthop-learning enable statement at the [set services flow-monitoring (version9 | version-ipfix) template template-name] hierarchy level.
Reporting of the true incoming interface for the sampled packets for inline flow monitoring (PTX Series)—Starting in Junos OS Release 17.4R1, inline flow monitoring reports the true incoming interface for the GRE-encapsulated packets entering the router for the configured inline flow monitoring filter criteria.
Support for inline JFlow version 9 flow templates (PTX 10016)—Starting in Junos OS Release 17.4R1, you can use inline-J-Flow export capabilities with version 9 flow templates to define a flow record template suitable for IPv4 or IPv6 traffic.
Software Installation and Upgrade
Device serial number added to DHCP option 60 (PTX1000)—Starting in Junos OS Release 17.4R1, DHCP option 60 (Vendor Class Identifier) includes the serial number of the device when you use zero touch provisioning to automate provisioning of the device configuration and software image. The serial number can uniquely identify the device in a broadcast network. The serial number appears in the format Juniper-model-number. For example, a PTX1000 router numbered DA000 appears as Juniper-ptx1000-DA000.