10-port 10-Gigabit Oversubscribed Ethernet PIC Overview

This section describes the main features and caveats of the 10-port 10-Gigabit Oversubscribed Ethernet (OSE) PIC and specifies which routers support these PICs.

The 10-port 10-Gigabit OSE PIC is supported by Juniper Networks TX Matrix and TX Matrix Plus and Juniper Networks T640 and T1600 Core Routers. It has the following features:

• Intelligent handling of oversubscribed traffic in applications such as data centers and dense-core uplinks
• Line rate operation for five 10-Gigabit Ethernet ports from each port group or a total WAN bandwidth of 100 Gbps with Packet Forwarding Engine bandwidth of 50 Gbps
• Flexible encapsulation, source address and destination address media access control (MAC) filtering, source address MAC learning, MAC accounting, and MAC policing
• Interface encapsulations, such as the following:
  • ethernet-ccc—Ethernet cross-connect
  • vlan-ccc—802.1Q tagging for a cross-connect
  • ethernet-tcc—Ethernet translational cross-connect
  • vlan-tcc—Virtual LAN (VLAN) translational cross-connect
  • extended-vlan-ccc—Standard Tag Protocol Identifier (TPID) tagging for a cross-connect
  • ethernet-vpls—Ethernet virtual private LAN service
  • vlan-vpls—VLAN virtual private LAN service
  • flexible-ethernet-services—Allows per-unit Ethernet encapsulation configuration
• Single, stacked, and flexible VLAN tagging modes
• Native VLAN configuration to allow untagged frames to be received on the tagged interfaces
• Maximum transmission unit (MTU) size of up to 9192 bytes for Ethernet frames
• Link aggregation group (LAG) on single chassis
• Interoperability with other 10-Gigabit Ethernet PICs in M Series and T Series routers in the LAN PHY and the WAN PHY modes
• Interrupt-driven link down detection mechanism
• Two-to-one oversubscription of traffic across a port group

  Traffic from ten ingress ports to the Packet Forwarding Engine traffic is statically mapped to one of the five egress ports. 10 Gbps worth of bandwidth toward the Packet Forwarding Engine is shared by two ingress ports (called a port group), thereby achieving two-to-one oversubscription. This scheme provides two-to-one oversubscription across a port group and not across the entire PIC.

• Four queues per physical interface on ingress and eight queues per physical interface on egress
• A separate control queue per physical interface to ensure that the control packets are not dropped during oversubscribed traffic
• SFP+ optical diagnostics

  SFP+ is a next-generation transceiver module form factor specified by the ANSI T11 Group for 8.5 Gbps and 10 Gbps fibre channel and Ethernet applications. The SFP+ form factor is 30 percent smaller than the XFP form factor. The benefits include higher port density, lower power modules, and lower system costs. The 10-port 10-Gigabit OSE PIC supports 10GBASE-SR and 10GBASE-LR SFP+ optics.

• Behavior aggregate (BA) classification (IPv4 DSCP, IPv6 DSCP, Inet precedence, IEEE 802.1P, IEEE 802.1AD, MPLS EXP) and fixed classification
• Weighted round-robin scheduling with two queue priorities (low and strict-high)
• Committed information rate and peak information rate shaping on a per-queue basis
• Excess information rate configuration for allocation of excess bandwidth

The 10-port 10-Gigabit OSE PIC has the following caveats:

• Source address and destination address MAC filtering takes place after oversubscription is handled.
• Oversubscription on the PIC operates across a port group of two ports and not at the PIC level.
• Queuing is not supported at the logical interface level.
• Committed information rate and peak information rate configurations are not supported at the physical interface level.
• There is limited packet buffering of 2 MB.
• Delay-bandwidth buffering configuration is not supported.
• Multifield classifiers are not supported at the PIC level.

  The multifield classification can be done at the Packet Forwarding Engine using the firewall filters, which overrides the classification done at the PIC level. The multifield classification at the Packet Forwarding Engine occurs after the PIC handles the oversubscribed traffic.

• Egress MAC policer statistics is not supported.
• Byte counters are not supported at the queue level.
• Only standard TPID (0x8100) is supported.
• Line timing mode is not supported.
• MAC level Rx VLAN tagged frames counter is not supported.

Table 79 lists the capabilities of 10-Port 10-Gigabit OSE PICs.