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Implementing BGP on Cisco IOS XR Software
How to Implement BGP on Cisco IOS XR Software
RC-122
Cisco IOS XR Routing Configuration Guide
OL-14356-01
DETAILED STEPS
Clearing Caches, Tables, and Databases
Perform this task to remove all contents of a particular cache, table, or database. The clear bgp command
resets the sessions of the specified group of neighbors (hard reset); it removes the TCP connection to the
neighbor, removes all routes received from the neighbor from the BGP table, and then re-establishes the
session with the neighbor. Clearing a cache, table, or database can become necessary when the contents
of the particular structure have become, or are suspected to be, invalid.
SUMMARY STEPS
1. clear bgp {ipv4 {unicast | multicast | labeled-unicast | all | tunnel | mdt} | ipv6 {unicast |
multicast | all | labeled-unicast} | all {unicast | multicast | all | labeled-unicast | mdt | tunnel} |
vpnv4 unicast | vrf {vrf-name | all} {ipv4 {unicast | labeled-unicast} | ipv6 unicast} | vpnv6
unicast} ip-address
2. clear bgp external
3. clear bgp *
Command or Action Purpose
Step 1
clear bgp {ipv4 {unicast | multicast |
labeled-unicast | all | tunnel | mdt} | ipv6
{unicast | multicast | all | labeled-unicast} |
all {unicast | multicast | all |
labeled-unicast | mdt | tunnel} | vpnv4 unicast
| vrf {vrf-name | all} {ipv4 {unicast |
labeled-unicast} | ipv6 unicast} | vpnv6
unicast} {* | ip-address | as as-number |
external} [graceful] soft [in [prefix-filter] |
out]
Example:
RP/0/RP0/CPU0:router# clear bgp ipv4 unicast
10.0.0.3
Clears a BGP neighbor.
• The * keyword resets all BGP neighbors.
• The ip-address argument specifies the address of the
neighbor to be reset.
• The as-number argument specifies that all neighbors
that match the autonomous system number be reset.
• The external keyword specifies that all external
neighbors are reset.
The graceful keyword specifies a graceful restart.