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ACX2200 System Overview

ACX2200 Universal Metro Router Overview

The ACX2200 Universal Metro Router is principally designed to provide superior management for rapid provisioning to the access network. The ACX Series routers support rich Gigabit Ethernet and 10-Gigabit Ethernet capabilities for uplink, along with support for legacy interfaces and Gigabit Ethernet interfaces for radio and NodeB connectivity in a compact form factor that is environmentally hardened and passively cooled. Seamless, end-to-end MPLS can be used to address legacy and emerging requirements to provide the foundation for a converged network that utilizes the same mobile backhaul infrastructure for business or residential services.

Benefits of the ACX2200 Router

  • Flexible design—A built-in service engine makes the ACX2200 fully customizable and future-proof for LTE-Advanced and 5G requirements. The ACX2200 provides a seamless, end-to-end service delivery platform that can grow and adapt to changing subscriber expectations and traffic demands.

  • Improved operational efficiency with zero-touch deployment (ZTD)—The ACX Series routers support a zero-touch deployment (ZTD) model that significantly reduces the time for any new equipment installation and provisioning, resulting in improved operational efficiency.

  • Installation flexibility with an environmentally hardened design—Most ACX Series routers are temperature hardened and support passive cooling for outdoor deployments in extreme weather conditions.

Chassis Description

The ACX Series router is a single-board router with a built-in Routing Engine and one Packet Forwarding Engine that has one “pseudo” Flexible PIC Concentrator (FPC 0 in the CLI). Because there is no switching fabric, the single Packet Forwarding Engine takes care of both ingress and egress packet forwarding:

  • Routing Engine—Provides Layer 3 routing services and network management.

  • Packet Forwarding Engine—Performs Layer 2 and Layer 3 packet switching, route lookups, and packet forwarding.

The ACX Series router is powered by Junos OS, supporting extensive L2 and L3 features, IP and MPLS with traffic engineering, rich network management, fault management, service monitoring and Operation, Administration, and Maintenance (OAM) capabilities, and an open software development kit (SDK) system that allows providers to customize and integrate operations with their own management systems. For a list of related Junos OS documentation, see https://www.juniper.net/documentation/software/junos/.

As part of the mobile backhaul, the ACX Series router at the cell site and the MX Series router at the aggregation layer provide comprehensive end-to-end Ethernet, MPLS, and OAM features with the one Junos OS running on both platforms.

The ACX2200 router is a compact gateway router that is one rack unit (U; that is, 1.75 in., or 4.45 cm) tall. Several gateway routers can be stacked in a single floor-to-ceiling rack for increased port density per unit of floor space.

The chassis is a rigid sheet metal structure that houses all the other router components (see Figure 1 and Figure 2). The chassis measures 1.75 in. (4.45 cm) high, 9.4 in. (24 cm) deep, and 17.5 in. (44.5 cm) wide. The outer edges of the mounting brackets extend the width to 19 in. (48 cm) (from the front-mounting brackets to the rear of the chassis). The chassis installs in standard 11.81-in. (300-mm) deep (or larger) enclosed cabinets, 19-in. equipment racks, or telco open-frame racks.

The compact routers are 1 U tall. Several routers can be stacked in a single floor-to-ceiling rack for increased port density per unit of floor space.

The ACX2200 routers contain four Gigabit Ethernet RJ-45 ports, four Gigabit Ethernet combination ports (either Gigabit Ethernet RJ-45 ports or Gigabit Ethernet SFP ports), two Gigabit Ethernet SFP ports, and two 10-Gigabit Ethernet SFP+ ports. Use only one set of these combination ports (labeled COMBO PORTS) at a time.

Figure 1: Front Panel of the ACX2200 RouterFront Panel of the ACX2200 Router
Figure 2: Rear View of the ACX2200 RouterRear View of the ACX2200 Router

ACX2200 Routers Hardware and CLI Terminology Mapping

Table 1 describes the hardware terms used in ACX2200 router documentation and the corresponding terms used in the Junos OS command line interface (CLI). Figure 3 shows the port locations of the interfaces.

Table 1: CLI Equivalents of Terms Used in Documentation for ACX2200 Routers

Hardware Item (as displayed in the CLI)

Description (as displayed in the CLI)

Value (as displayed in the CLI)

Item in Documentation

Additional Information

Chassis

ACX2200

Router chassis

Chassis Physical Specifications for ACX2200 Routers

FPC (n)

Abbreviated name of the Flexible PIC Concentrator (FPC)

ACX2200

Value of n is always 0.

The router does not have actual FPCs. In this case, FPC refers to the router itself

Interface Naming Conventions Used in the Junos OS Operational Commands

PIC (n)

Abbreviated name of the Physical Interface Card (PIC)

n is a value in the range of 0–3.

The router does not have actual PIC devices; see entries for PIC 0 through PIC 3 for the equivalent item on the router

Interface Naming Conventions Used in the Junos OS Operational Commands

4x 1GE (RJ-45)

PIC 0

Built-in uplink ports on the front panel of the router

ACX2200 Universal Metro Router Overview

One of the following:

  • 4x 1GE (RJ-45)

  • 4x 1GE (SFP)

PIC 1

Built-in uplink ports on the front panel of the router

ACX2200 Universal Metro Router Overview

2x 1GE (SFP)

PIC 2

Built-in uplink ports on the front panel of the router

ACX2200 Universal Metro Router Overview

2x 10GE (SFP+)

PIC 3

Built-in uplink ports on the front panel of the router

ACX2200 Universal Metro Router Overview

Xcvr (n)

Abbreviated name of the transceiver

n is a value equivalent to the number of the port in which the transceiver is installed.

Optical transceivers

Uplink Ports on ACX2200 Routers

Power supply (n)

Built-in power supply

Value of n is always 0.

DC power supply

ACX2200 Power Overview

Fan

Fan

Note:

ACX2200 routers are fanless models.

Fan

Cooling System and Airflow in an ACX2200 Router

Figure 3: ACX2200 Interface Port MappingACX2200 Interface Port Mapping

Packet Flow on ACX Series Routers

The class-of-service (CoS) architecture for ACX Series routers is in concept similar to that of MX Series routers. The general architecture for ACX Series routers is shown in Figure 4.

Figure 4: ACX Series Router Packet Forwarding and Data FlowACX Series Router Packet Forwarding and Data Flow

Based on the model, ACX routers contain a built-in Routing Engine and Packet Forwarding Engine and can contain both T1/E1 and Gigabit Ethernet Ports.

The Packet Forwarding Engine has one or two “pseudo” Flexible PIC Concentrators. Because there is no switching fabric, the single Packet Forwarding Engine takes care of both ingress and egress packet forwarding.

Fixed classification places all packets in the same forwarding class, or the usual multifield (MF) or behavior aggregate (BA) classifications can be used to treat packets differently. BA classification with firewall filters can be used for classification based on IP precedence, DSCP, IEEE, or other bits in the frame or packet header.

However, the ACX Series routers can also employ multiple BA classifiers on the same physical interface. The physical interfaces do not have to employ the same type of BA classifier. For example, a single physical interface can use classifiers based on IP precedence as well as IEEE 802.1p. If the CoS bits of interest are on the inner VLAN tag of a dual-tagged VLAN interface, the classifier can examine either the inner or outer bits. (By default, the classification is done based on the outer VLAN tag.)

Eight queues per egress port support scheduling using the weighted deficit round- robin (WDRR) mechanism, a form of round-robin queue servicing. The supported priority levels are strict-high and default (low). The ACX series router architecture supports both weighted random early detect (WRED) and weighted tail drop (WTD).

All CoS features are supported at line rate.

The packet pipeline through an ACX Series router is shown in Figure 5. Note that the rate limiting is done with an integrated architecture along with all other CoS functions. Scheduling and shaping are supported on the output side.

Figure 5: ACX Series Router Packet HandlingACX Series Router Packet Handling

Protocols and Applications Supported by the ACX2200 Router

Table 2 contains the first Junos OS Release support for protocols and applications on ACX2200 routers. A dash indicates that the protocol or application is not supported.

Note:

The [edit logical-systems logical-system-name] hierarchy level is not supported on ACX Series routers.

Table 2: Protocols and Applications Supported by ACX2200 Routers

Protocol or Application

First Supported Junos OS Release

Interface and Encapsulation Types  

Ethernet interfaces—10/100/1000, 1G, 10G

12.3X54

–D15

ATM Interfaces (including IMA interfaces)

E1 Interfaces

T1 Interfaces

Circuit emulation interfaces

Layer 3  

Static routes

12.3X54

–D15

OSPF

12.3X54

–D15

IS-IS

12.3X54

–D15

Internet Control Message Protocol (ICMP)

12.3X54

–D15

Address Resolution Protocol (ARP)

12.3X54

–D15

Bidirectional Forwarding Detection (BFD) protocol

12.3X54

–D15

Dynamic Host Configuration Protocol (DHCP)

12.3X54

–D15

IP fast reroute (FRR) (OSPF, IS-IS)

12.3X54

–D15

Maximum transmission unit (MTU) 1518

12.3X54

–D15

RSVP

12.3X54

–D15

LDP (targeted and direct)

12.3X54

–D15

MPLS, VPLS, VPNs  

Static label-switched path (LSP)

12.3X54

–D15

FRR

12.3X54

–D15

Traffic engineering

12.3X54

–D15

Diffserv traffic engineering

12.3X54

–D15

E-LINE

12.3X54

–D15

Pseudowire Emulation Edge to Edge [PWE3 (signaled)]

12.3X54

–D15

Static Ethernet PWs

12.3X54

–D15

Layer 2 circuits

12.3X54

–D15

IEE802.1ag CC monitoring on active and standby pseudowires

12.3X54

–D15

Edge protection using static (Virtual Private Wire Service (VPWS)

12.3X54

–D15

Ethernet Layer 2  

802.3ah EFM OAM

12.3X54

–D15

802.1ag connectivity fault management (CFM)

12.3X54

–D15

IEE802.1ag interface-status type, length, and value (TLV)

12.3X54

–D15

QoS  

Firewall filters (access control list—ACLs)— family inet

12.3X54

–D15

Match Conditions for MPLS Traffic (ACX Series Routers)

12.3X54

–D15

Firewall filters—family ccc/any

12.3X54

–D15

Policing—per logical interface

12.3X54

–D15

Policing—per physical interface

12.3X54

–D15

Policing—per family

12.3X54

–D15

TrTCM (color aware, color blind)

12.3X54

–D15

SrTCM (color aware, color blind)

12.3X54

–D15

Host protection

12.3X54

–D15

8 queues per port

12.3X54

–D15

Priority queuing 

12.3X54

–D15

Rate control

12.3X54

–D15

Scheduling with two different priorities 

12.3X54

–D15

Low latency queue (LLQ)

12.3X54

–D15

WRED with two levels of DP 

12.3X54

–D15

Classification—DSCP 

12.3X54

–D15

Classification—MPLS EXP 

12.3X54

–D15

Classification—IEEE 802.1p 

12.3X54

–D15

Rewrite—DSCP 

12.3X54

–D15

Rewrite MPLS EXP

12.3X54

–D15

Rewrite 802.1p 

12.3X54

–D15

Rewrite MPLS and DSCP to different values

12.3X54

–D15

Timing  

Timing–1588-v2, 1588-2008–client clock

12.3X54

–D15

SyncE

12.3X54

–D15

Building-integrated timing supply (BITS)

12.3X54

–D15

Clock Sync

12.3X54

–D15

Redundant clock (multiple 1588 primary clocks)

OAM, Troubleshooting, Manageability, Lawful Intercept  

Network Time Protocol (NTP)

12.3X54

–D15

SNMP

12.3X54

–D15

802.1ag CFM

12.3X54

–D15

802.3ah EFM

12.3X54

–D15

Y.1731 fault and performance management

12.3X54

–D15

MPLS OAM

12.3X54

–D15

RMON

12.3X54

–D15

Layer 2 traceroute

12.3X54

–D15

DNS

12.3X54

–D15

TFTP for software downloads

12.3X54

–D15

Port mirroring [local port mirroring]

12.3X54

–D15

Interface loopback

12.3X54

–D15

Interface byte and packet stats (full, as implemented in Junos OS)

12.3X54

–D15

Interface queue stats

12.3X54

–D15

Drop packet stats

12.3X54

–D15

Distinguish each 802.1ag connection by VLAN-ID

12.3X54

–D15

Interface passive-monitor-mode

12.3X54

–D15

Multipacket mirror

Security  

TACACS AAA

12.3X54

–D15

RADIUS authentication

12.3X54

–D15

Control plane DOS prevention

12.3X54

–D15

High Availability  

MPLS FRR

12.3X54

–D15

BFD

12.3X54

–D15

ATM Transport  

ATM over PWE3

12.3X54

–D15

RFC4717 ATM encapsulation: S6.1 ATM N to one cell mode (required by standard)

12.3X54

–D15

RFC4717: S6.3—ATM AAL5 SDU encapsulation (optional)

12.3X54

–D15

ATM PWE3 control word

12.3X54

–D15

ATM PWE3 by means of dynamic labels

12.3X54

–D15

ATM VPI/VCI swapping

12.3X54

–D15

ATM idle/unassigned cell suppression

12.3X54

–D15

ATM support for N to 1 PW promiscuous mode: 1 PW per port and 1 PW per VPI

12.3X54

–D15

Cell concatenation (1 to 30 cells per packet)

12.3X54

–D15

Packet/byte counters per VP and VC

12.3X54

–D15

ATM IMA

12.3X54

–D15

ATM Encapsulation  

AAL5 SDU [n-to-1 cell relay]

12.3X54

–D15

ATM Queuing  

ATM service categories (CBR, nrt-VBR, UBR) to the UNI

12.3X54

–D15

MAP ATM service categories to PW EXP bits 

12.3X54

–D15

Input policing per VC

12.3X54

–D15

VC output shaping

12.3X54

–D15

Early packet discard

12.3X54

–D15

MIBs  

Standard SNMP MIBs

12.3X54

–D15

Juniper Networks enterprise-specific MIBs

12.3X54

–D15

TDM Pseudowire  

Structure-Agnostic TDM over packet (SAToP)

12.3X54

–D15