A9K-8T-L Cisco ASR 9000 Series Low Queue Line Card

Cisco ASR 9000 Line Card A9K-8T-L 8-Port 10GE Low Queue Line Card, Requires XFPs

Part Number


Product Description

8-Port 10GE Low Queue Line Card, requires XFPs

Total queues

8 per port



Ethernet flow points (EFPs)


Cisco IOS XR Software support

●Modular software design:Cisco IOS XR Software demonstrates Cisco networking leadership in helping customers realize the power of their networks and the Internet. The software provides exceptional routing-system scalability, high availability, service isolation, and manageability to meet the mission-critical requirements of next-generation networks.
●Operating system infrastructure protection:Cisco IOS XR Software provides a microkernel architecture that forces all but the most critical functions, such as memory management and thread distribution, outside of the kernel. This setup prevents failures in applications, file systems, and even device drivers from causing widespread service disruption.
●Process and thread protection:Each process – even individual process threads – occurs in its own protected memory space, and communications between processes are accomplished through well-defined, secure, and version-controlled application programming interfaces (APIs). This setup significantly minimizes the effect that any process failure can have on other processes.
●Process restart:The line cards offer the ability to restart critical control-plane processes both manually and automatically in response to a process failure, rather than restarting the entire OS. This feature helps to support the Cisco IOS XR Software goal of continuous system availability and allows for quick recovery from process or protocol failures with minimal disruption to customers or traffic.
●State checkpointing:The line cards offer the capability to maintain a memory and critical operating state across process restarts so that routing adjacencies and signaling state can be maintained during an RSP switchover.

Flexible Ethernet services

●Ethernet virtual connections (EVCs):Ethernet services are supported using individual EVCs to carry traffic belonging to a specific service type or end user through the network. EVC-based services can be used in conjunction with MPLS-based L2VPNs and native Ethernet switching deployments.
●Flexible VLAN classification:VLAN classification into EFPs includes single-tagged VLANs, double-tagged VLANs (QinQ and 802.1ad), contiguous VLAN ranges, and noncontiguous VLAN lists.
●IEEE bridging:The line cards support native bridging based on IEEE 802.1Q, IEEE 802.1ad, 802.1ah, and QinQ VLAN encapsulation mechanisms.
●IEEE 802.1s Multiple Spanning Tree (MST):MST extends the 802.1w Rapid Spanning Tree Protocol (RSTP) to multiple spanning trees, providing rapid convergence and load balancing.
●MST Access Gateway:The MST Access Gateway provides a resilient, fast-convergence mechanism for aggregating and connecting to Ethernet-based access rings.

L2VPN services

●Virtual Private LAN Services (VPLS):These services are included in a class of VPN that supports the connection of multiple sites in a single bridged domain over a managed IP/MPLS network. VPLS presents an Ethernet interface to customers, simplifying the LAN and WAN boundary for service providers and customers, and supporting rapid and flexible service provisioning, because the service bandwidth is not tied to the physical interface. All services in a VPLS appear to be on the same LAN, regardless of location.
●Hierarchical VPLS (HVPLS):HVPLS provides a level of hierarchy at the edge of the VPLS network for increased scale. Two options of HVPLS are supported: QinQ access and Ethernet over MPLS (pseudowire) access.
●Virtual Private Wire Service (VPWS) with Ethernet over MPLS (EoMPLS):EoMPLS transports Ethernet frames across an MPLS core using pseudowires. Individual EFPs or traffic from an entire port can be transported over the MPLS backbone using pseudowires to an egress interface or subinterface.
●Pseudowire redundancy:Pseudowire redundancy supports the definition of a backup pseudowire to protect a primary pseudowire that fails.
●G.8032:G.8032 is a feature that provides the sub-50-ms protection for Ethernet traffic in a ring topology. The implementation on the Cisco ASR 9000 Series is compliant with version 2 of the ITU-T standard.
●Multisegment pseudowire stitching:Multisegment pseudowire stitching is a method for interworking two pseudowires together to form a cross-connect relationship.


●IPv4 Multicast:The line cards support Internet Group Management Protocol Versions 2 and 3 (IGMPv2 and v3), Protocol Independent Multicast-Source Specific Multicast (PIM-SSM), PIM sparse mode (PIM-SM), PIM SSM Mapping, Multicast Source Discovery Protocol (MSDP), Multicast VPN, and Anycast rendezvous point (RP).
●IGMP v2 and v3 snooping:This Layer 2 mechanism efficiently tracks multicast membership on an L2VPN network. Individual IGMP joins are snooped at the VLAN level or pseudowire level and then results are summarized into a single upstream join message. In residential broadband deployments, this scenario allows the network to send only channels that are being watched to the downstream users.


●Ethernet OA&M (EOAM) (IEEE 802.3ah):Ethernet link layer OA&M is a vital component of EOAM that provides physical-link OA&M to monitor link health and assist in fault isolation. Along with 802.1ag, Ethernet link layer OA&M can be used to assist in rapid link-failure detection and signaling to remote end nodes of a local failure.
●EOAM (IEEE 802.1ag):Ethernet Connectivity Fault Management (E-CFM) is a subset of EOAM that provides numerous protocols and procedures that allow discovery and verification of the path through 802.1 bridges and LANs.
●EOAM (ITU Y.1731):Y.1731 provides