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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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Use <strong>the</strong> clear ip bgp command in EXEC Privilege mode at <strong>the</strong> system prompt to reset a BGP connection<br />

using BGP soft reconfiguration.<br />

Command Syntax Command Mode Purpose<br />

clear ip bgp {* | neighbor-address<br />

| AS Numbers | ipv4 |<br />

peer-group-name} [soft [in | out]]<br />

neighbor {ip-address |<br />

peer-group-name}<br />

soft-reconfiguration inbound<br />

When soft-reconfiguration is enabled <strong>for</strong> a neighbor and <strong>the</strong> clear ip bgp soft in command is executed,<br />

<strong>the</strong> update database stored in <strong>the</strong> router is replayed and updates are reevaluated. With this command, <strong>the</strong><br />

replay and update process is triggered only if route-refresh request is not negotiated with <strong>the</strong> peer. If <strong>the</strong><br />

request is indeed negotiated (upon execution of clear ip bgp soft in), <strong>the</strong>n BGP sends a route-refresh<br />

request to <strong>the</strong> neighbor and receives all of <strong>the</strong> peer’s updates.<br />

To use soft reconfiguration, or soft reset, without preconfiguration, both BGP peers must support <strong>the</strong> soft<br />

route refresh capability, which is advertised in <strong>the</strong> open message sent when <strong>the</strong> peers establish a TCP<br />

session.<br />

To determine whe<strong>the</strong>r a BGP router supports this capability, use <strong>the</strong> show ip bgp neighbors command.<br />

If a router supports <strong>the</strong> route refresh capability, <strong>the</strong> following message should be displayed:<br />

Received route refresh capability from peer.<br />

If you specify a BGP peer group by using <strong>the</strong> peer-group-name argument, all members of <strong>the</strong> peer group<br />

inherit <strong>the</strong> characteristic configured with this command.<br />

The following (Figure 362) enables inbound soft reconfiguration <strong>for</strong> <strong>the</strong> neighbor 10.108.1.1. All updates<br />

received from this neighbor are stored unmodified, regardless of <strong>the</strong> inbound policy. When inbound soft<br />

reconfiguration is done later, <strong>the</strong> stored in<strong>for</strong>mation is used to generate a new set of inbound updates.<br />

Figure 362 Command example: router bgp<br />

EXEC Privilege Clear all in<strong>for</strong>mation or only specific details.<br />

*: Clear all peers<br />

neighbor-address: Clear <strong>the</strong> neighbor with this IP<br />

address<br />

AS Numbers: Peers’ AS numbers to be cleared<br />

ipv4: Clear in<strong>for</strong>mation <strong>for</strong> IPv4 Address family<br />

peer-group-name: Clear all members of <strong>the</strong><br />

specified peer group<br />

CONFIG-ROUTER-<br />

BGP<br />

<strong>Force10</strong>>router bgp 100<br />

neighbor 10.108.1.1 remote-as 200<br />

neighbor 10.108.1.1 soft-reconfiguration inbound<br />

Enable soft-reconfiguration <strong>for</strong> <strong>the</strong> BGP neighbor<br />

specified. BGP stores all <strong>the</strong> updates received by<br />

<strong>the</strong> neighbor but does not reset <strong>the</strong> peer-session.<br />

Entering this command starts <strong>the</strong> storage of updates, which is required<br />

to do inbound soft reconfiguration. Outbound BGP soft reconfiguration<br />

does not require inbound soft reconfiguration to be enabled.<br />

<strong>FTOS</strong> <strong>Configuration</strong> <strong>Guide</strong>, version 7.7.1.0 513

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