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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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• Save all FIB and CAM entries on <strong>the</strong> line card and continue <strong>for</strong>warding traffic while <strong>the</strong> secondary<br />

RPM is coming online.<br />

• Advertise to all BGP neighbors and peer-groups that <strong>the</strong> <strong>for</strong>warding state of all routes has been saved.<br />

This prompts all peers to continue saving <strong>the</strong> routes <strong>the</strong>y receive from your E-<strong>Series</strong> and to continue<br />

<strong>for</strong>warding traffic.<br />

• Bring <strong>the</strong> secondary RPM online as <strong>the</strong> primary and re-open sessions with all peers operating in “no<br />

shutdown” mode.<br />

• Defer best path selection <strong>for</strong> a certain amount of time. This help optimize path selection and results in<br />

fewer updates being sent out.<br />

Enable graceful restart using <strong>the</strong> configure router bgp graceful-restart command. The table below<br />

shows <strong>the</strong> command and its available options:<br />

Command Syntax Command Mode Usage<br />

bgp graceful-restart CONFIG-ROUTER-<br />

BGP<br />

bgp graceful-restart<br />

[restart-time time-in-seconds]<br />

bgp graceful-restart<br />

[stale-path-time time-in-seconds]<br />

bgp graceful-restart [role<br />

receiver-only]<br />

CONFIG-ROUTER-<br />

BGP<br />

CONFIG-ROUTER-<br />

BGP<br />

CONFIG-ROUTER-<br />

BGP<br />

Enable graceful restart <strong>for</strong> <strong>the</strong> BGP node.<br />

Set maximum restart time <strong>for</strong> all peers. Default<br />

is 120 seconds.<br />

Set maximum time to retain <strong>the</strong> restarting peer’s<br />

stale paths. Default is 360 seconds.<br />

BGP graceful restart is active only when <strong>the</strong> neighbor becomes established. O<strong>the</strong>rwise it is disabled.<br />

Graceful-restart applies to all neighbors with established adjacency.<br />

With <strong>the</strong> graceful restart feature, <strong>FTOS</strong> enables <strong>the</strong> receiving/restarting mode by default. In receiver-only<br />

mode, graceful restart saves <strong>the</strong> advertised routes of peers that support this capability when <strong>the</strong>y restart.<br />

However, <strong>the</strong> E-<strong>Series</strong> does not advertise that it saves <strong>the</strong>se <strong>for</strong>warding states when it restarts. Essentially,<br />

this option provides support <strong>for</strong> remote peers <strong>for</strong> <strong>the</strong>ir graceful restart without supporting <strong>the</strong> feature itself.<br />

You can implement BGP graceful restart ei<strong>the</strong>r by neighbor or by BGP peer-group. For more in<strong>for</strong>mation,<br />

please see <strong>the</strong> following table or <strong>the</strong> <strong>FTOS</strong> Command Line Interface Reference.<br />

Command Syntax Command Mode Purpose<br />

neighbor {ip-address |<br />

peer-group-name} graceful-restart<br />

neighbor {ip-address |<br />

peer-group-name} graceful-restart<br />

[restart-time time-in-seconds]<br />

neighbor {ip-address |<br />

peer-group-name} graceful-restart<br />

[role receiver-only]<br />

CONFIG-ROUTER-<br />

BGP<br />

CONFIG-ROUTER-<br />

BGP<br />

CONFIG-ROUTER-<br />

BGP<br />

Local router supports graceful restart as a<br />

receiver only.<br />

Add graceful restart to a BGP neighbor or<br />

peer-group.<br />

Set maximum restart time <strong>for</strong> <strong>the</strong> neighbor or<br />

peer-group. Default is 120 seconds.<br />

Local router supports graceful restart <strong>for</strong> this<br />

neighbor or peer-group as a receiver only.<br />

<strong>FTOS</strong> <strong>Configuration</strong> <strong>Guide</strong>, version 7.7.1.0 491

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