Basic System Configuration Guide System Management
Edition: 01 3HE 11010 AAAC TQZZA 209
MC-LAG includes support for hash–based peer authentication, configurable
heartbeat timers between peers, heartbeat multiplier, LAG bound to MC-LAG with
LACP and support for any valid IP link between peers for the multi-chassis Control
Protocol (MCCP). MC-LAG supports a configurable fault propagation delay and also
provides an option to shut down a MEP on a standby endpoint.
MC-LAG maintains state across a CSM switchover event. The switchover event is
transparent to peer MC-LAG nodes where sessions and state are preserved. MC-
LAG is supported on the following platforms, adapter cards, and modules:
• 7705 SAR-8/7705 SAR-18: 8-port Ethernet Adapter card, version 2
• 7705 SAR-8 Shelf V2 with CSMv2 only/7705 SAR-18: 6-port Ethernet 10Gbps
Adapter card
• 7705 SAR-8/7705 SAR-18: 8-port Gigabit Ethernet Adapter card
• 7705 SAR-18: 10-port 1GigE/1-port 10GigE X-Adapter card
• 7705 SAR-8/7705 SAR-18: Packet Microwave Adapter card
• 6-port SAR-M Ethernet module
• 7705 SAR-M: all platform variants (the port must be in access mode and
autonegotiation must be off or limited)
• 7705 SAR-X
6.2.1.2 Nonstop Routing (NSR)
With NSR on the 7705 SAR, routing neighbors are unaware of a routing process
fault. If a fault occurs, a reliable and deterministic activity switch to the inactive control
complex occurs such that routing topology and reachability are not affected, even in
the presence of routing updates. NSR achieves high availability through
parallelization by maintaining up-to-date routing state information, at all times, on the
standby route processor. This capability is achieved independently of protocols or
protocol extensions, providing a more robust solution than graceful restart protocols
between network routers.
The NSR implementation on the 7705 SAR applies to all supported routing protocols.
NSR makes it possible to keep the existing sessions (such as LDP) during a CSM
switchover, including support for MPLS signaling protocols. Peers will not see any
change.
Traditionally, high availability issues have been patched through non-stop forwarding
solutions. NSR overcomes these limitations by delivering an intelligent hitless
failover solution.
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