Brocade Multi-Service IronWare Routing Configuration Guide Manual do Utilizador descarregar pdf (Página 752)

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724 Multi-Service IronWare Routing Configuration Guide

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IPv6 IS-IS Non-Stop Routing

IPv6 IS-IS Non-Stop Routing (NSR) enables the IPv6 IS-IS router to maintain topology and data flow

to avoid re-convergence in the network during a processor switchover or hitless-reload event. The

IS-IS Bidirectional Forwarding Detection (BFD) sessions survive the switchover and hitless-reload

conditions. In general, a router restart causes its peer to remove the routes originated from the

router and reinstalls them. This IS-IS NSR feature enables the router to maintain neighbors and LSA

database with its peer on the event of a router restart. This feature is compatible with IPv4 IS-IS

NSR.

NOTE

IPv6 IS-IS NSR is independent of Graceful Restart (GR) and GR help role mechanisms.

Limitations

• The IS-IS over GRE tunnel feature does not support IS-IS NSR. The GRE tunnel interface types

are not supported.

• The IS-IS shortcuts are not supported because they depend on the MPLS tunnel.

• If the IS-IS hellos are forwarded at Layer 2 and the device executes a hitless-reload, hellos will

not be forwarded for a brief time. The IS-IS adjacencies are lost for 12 seconds and there will

be data traffic loss.

• The configuration events that occur close to switchover or hitless-reload may get lost due to CLI

synchronization issues.

• The neighbor or interface state changes close to switchover or hitless-reload cannot be

handled.

• The IS-IS neighbor hold timer is restarted upon IS-IS NSR switchover or hitless-reload.

• The traffic counters are not synchronized because the neighbor and LSP database counters

are recalculated on the standby module during synchronization.

• With IS-IS NSR enabled, after switchover or hitless-reload to standby MP, IS-IS routes, LSP

database and neighbor adjacencies are maintained so that there will be no loss of existing

traffic to the IS-IS destinations.

• The IS-IS NSR hitless failover event may not be completely invisible to the network because,

after switchover, additional flooding of CSNP packets will occur in the directly connected

neighbors.

Configuring IS-IS NSR

To globally enable IS-IS NSR, enter the following commands.

Brocade(config)# router isis

Brocade(config-isis-router)# nonstop-routing

To globally disable IS-IS NSR, enter the following commands.

Brocade(config)# router isis

Brocade(config-isis-router)# no nonstop-routing

Syntax: [no] nonstop-routing

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