PurposeCommand or Action
Specifies the autonomous system number and enters the BGP
configuration mode, allowing you to configure the BGP
routing process.
router bgp as-number
Example:
RP/0/RSP0/CPU0:router(config)# router bgp 10
Step 2
Specifies the IPv4 address family unicast and enters address
family configuration mode.
address-family ipv4 unicast
Example:
RP/0/RSP0/CPU0:router(config-bgp)#
address-family ipv4 unicast
Step 3
Exits router address family configuration mode, and returns
to BGP configuration mode.
exit
Example:
RP/0/RSP0/CPU0:router(config-bgp-af)# exit
Step 4
Enters neighbor group configuration mode.
neighbor-group name
Example:
RP/0/RSP0/CPU0:router(config-bgp)#
neighbor-group n1
Step 5
Configures TCP maximum segment size. The range is from
68 to 10000.
tcp mss segment-size
Example:
RP/0/RSP0/CPU0:router(config-bgp-nbrgrp)# tcp
mss 500
Step 6
Specifies the IPv4 address family unicast and enters address
family configuration mode.
address-family ipv4 unicast
Example:
RP/0/RSP0/CPU0:router(config-bgp-nbrgrp)#
address-family ipv4 unicast
Step 7
Exits router address family configuration mode.exit
Example:
RP/0/RSP0/CPU0:router(config-bgp-nbrgrp-af)#
exit
Step 8
Exits the neighbor group configuration mode.exit
Example:
RP/0/RSP0/CPU0:router(config-bgp-nbrgrp)# exit
Step 9
Places the router in neighbor configuration mode for BGP
routing and configures the neighbor IP address as a BGP
peer.
neighbor ip-address
Example:
RP/0/RSP0/CPU0:router(config-bgp)# neighbor
10.0.0.2
Step 10
Cisco ASR 9000 Series Aggregation Services Router Routing Configuration Guide, Release 5.3.x
94
Implementing BGP
Configuring Per Neighbor TCP MSS
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