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FTOS Configuration Guide for the C-Series - Force10 Networks

FTOS Configuration Guide for the C-Series - Force10 Networks

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If a graceful-restart capable router recognizes that a graceful-restart capable neighbor has restarted, it<br />

preserves <strong>the</strong> state from <strong>the</strong> neighbor and continues <strong>for</strong>warding multicast traffic while <strong>the</strong> neighbor<br />

restarts.<br />

• The router holds on to <strong>the</strong> entries learned from <strong>the</strong> neighbor <strong>for</strong> <strong>the</strong> graceful restart interval. If it does<br />

not receive a hello from <strong>the</strong> neighbor within this time, it purges all state associated with <strong>the</strong> neighbor.<br />

• If <strong>the</strong> neighbor restarts and sends a hello with a new GenID be<strong>for</strong>e this interval expires, <strong>the</strong> router<br />

sends a join message towards <strong>the</strong> neighbor <strong>for</strong> <strong>the</strong> relevant entries.<br />

If a graceful-restart capable router restarts, <strong>the</strong> router preserves all multicast entries in hardware until it<br />

receives and consolidates joins from its graceful-restart capable neighbors. The router is not taken off <strong>the</strong><br />

<strong>for</strong>warding path during restart.<br />

Enable PIM-SM graceful restart (non-stop <strong>for</strong>warding capability) using <strong>the</strong> command ip pim<br />

graceful-restart nsf from CONFIGURATION mode. There are two options with this command:<br />

• restart-time is <strong>the</strong> time required by <strong>the</strong> <strong>Force10</strong> system to restart. The default value is 180 seconds.<br />

• stale-entry-time is <strong>the</strong> maximum amount of time that <strong>the</strong> <strong>Force10</strong> system preserves entries from a<br />

restarting neighbor. The default value is 60 seconds.<br />

In helper-only mode, <strong>the</strong> system to preserves <strong>the</strong> PIM states of a neighboring router while <strong>the</strong> neighbor<br />

gracefully restarts, but <strong>the</strong> <strong>Force10</strong> system allows itself to be taken off <strong>the</strong> <strong>for</strong>warding path if it restarts.<br />

Enable this mode using <strong>the</strong> command ip pim graceful-restart helper-only. This mode takes precedence<br />

over any graceful restart configuration.<br />

Relevant MIBs<br />

The PIM MIB is supported only on plat<strong>for</strong>m e<br />

<strong>FTOS</strong> fully supports <strong>the</strong> PIM MIB as specified in RFC 5060 with some exceptions.<br />

• The following tables are not supported:<br />

• pimBidirDFElectionTable<br />

• pimAnycastRPSetTable<br />

• The OIDs related to InvalidRegisterMsgs reflect <strong>the</strong> last received invalid register message (IPv4 or<br />

IPv6). Similarly, <strong>the</strong> OIDs related to InvalidJoinPruneMsgs reflect <strong>the</strong> last received invalid Join or<br />

Prune message.<br />

• OIDs which refer to any timer show <strong>the</strong> time that <strong>the</strong> timer started; it is 0 o<strong>the</strong>rwise.<br />

<strong>FTOS</strong> <strong>Configuration</strong> <strong>Guide</strong>, version 7.7.1.0 633

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