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7.8.1.0 - Force10 Networks

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To disable this feature, use the no neighbor allow-as in number command in the CONFIGURATION<br />

ROUTER BGP mode.<br />

Figure 133 Allowas-in information shown<br />

R2(conf-router_bgp)#show conf<br />

!<br />

router bgp 65123<br />

bgp router-id 192.168.10.2<br />

network 10.10.21.0/24<br />

network 10.10.32.0/24<br />

network 100.10.92.0/24<br />

network 192.168.10.0/24<br />

bgp four-octet-as-support<br />

neighbor 10.10.21.1 remote-as 65123<br />

neighbor 10.10.21.1 filter-list Laura in<br />

neighbor 10.10.21.1 no shutdown<br />

neighbor 10.10.32.3 remote-as 65123<br />

neighbor 10.10.32.3 no shutdown<br />

neighbor 100.10.92.9 remote-as 65192<br />

neighbor 100.10.92.9 local-as 6500<br />

neighbor 100.10.92.9 no shutdown<br />

neighbor 192.168.10.1 remote-as 65123<br />

neighbor 192.168.10.1 update-source Loopback 0<br />

neighbor 192.168.10.1 no shutdown<br />

neighbor 192.168.12.2 remote-as 65123<br />

neighbor 192.168.12.2 allowas-in 9<br />

neighbor 192.168.12.2 update-source Loopback 0<br />

neighbor 192.168.12.2 no shutdown<br />

R2(conf-router_bgp)#R2(conf-router_bgp)#<br />

Enable graceful restart<br />

Number of Times ASN 65123<br />

Can Appear in AS PATH<br />

Use this feature to lessen the negative effects of a BGP restart. FTOS advertises support for this feature to<br />

BGP neighbors through a capability advertisement. You can enable graceful restart by router and/or by<br />

peer or peer group.<br />

Note: By default, BGP graceful restart is disabled.<br />

The default role for BGP on is as a receiving or restarting peer. If you enable BGP, when a peer that<br />

supports graceful restart resumes operating, FTOS performs the following tasks:<br />

• Continues saving routes received from the peer if the peer advertised it had graceful restart capability.<br />

Continues forwarding traffic to the peer.<br />

• Flags routes from the peer as Stale and sets a timer to delete them if the peer does not perform a<br />

graceful restart.<br />

• Deletes all routes from the peer if forwarding state information is not saved.<br />

• Speeds convergence by advertising a special update packet known as an end-of-RIB marker. This<br />

marker indicates the peer has been updated with all routes in the local RIB.<br />

If you configure your system to do so, FTOS can perform the following actions during a hot failover:<br />

FTOS Configuration Guide, version <strong>7.8.1.0</strong> 229

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