Route-map set commands and AS4s
You can prepend an AS4 number to an autonomous system path or make the autonomous system number a tag attribute for a route
map as shown here.
device(config-routemap test)# set as-path prepend 7701000
Syntax: [no] set as-path prepend num,num , ... | tag
Use the no form of this command to remove the conguration.
NOTE
If the autononous system path for a route map has prepended ASNs and you want to use the no form of the command to
delete the conguration, you must include the prepended ASNs in the no set as-path entry. For example, if 70000 and 70001
have been prepended to a route map, enter no set as-path prepend 70000 70001 . As a shortcut, in the conguration context
of a particular route map, you can also copy and paste ASNs from the output of show commands, such as show route-map or
show ip bgp route .
Use the prepend keyword to prepend one or more ASNs. The maximum number of ASNs that you can prepend is 16. The range for
each ASN is 1 - 4294967295.
Entering the tag keyword sets the tag as an AS-path attribute.
Clearing BGP4 routes to neighbors
You can clear BGP4 connections using the AS4 as an argument with the clear ip bgp neighbor command in the
conguration context
level of the CLI. as shown.
device(config)# clear ip bgp neighbor 80000
Syntax: clear ip bgp neighbor all | ip-addr | peer-group-name | as-num [ last-packet-with-error | notication-errors | [ soft [ in | out ] |
soft-outbound ]
The neighbor specication is either all, ip-addr , peer-group-name , or as-num . The all parameter species all neighbors. The ip-addr
parameter species a neighbor by its IP interface with the device. The peer-group-name species all neighbors in a specic peer group.
The as-num parameter species all neighbors within the specied AS. After choosing one mandatory parameter, you can choose an
optional parameter.
The soft in and soft out parameters determine whether to refresh the routes received from the neighbor or the routes sent to the
neighbor. If you do not specify in or out , the device performs a soft refresh in both options:
• soft in performs one of the following actions on inbound routes, according to other conguration settings:
– If you enabled soft reconguration for the neighbor or peer group, soft in updates the routes by comparing the route
policies against the route updates that the device has stored. Soft reconguration does not request additional updates from
the neighbor or otherwise aect the session with the neighbor.
– If you did not enable soft reconguration, soft in requests the entire BGP4 route table on the neighbor (Adj-RIB-Out), then
applies the lters to add, change, or exclude routes.
– If a neighbor does not support dynamic refresh, soft in resets the neighbor session.
• soft out updates all outbound routes and then sends the entire BGP4 route table for the device (Adj-RIB-Out) to the neighbor
after the device changes or excludes the routes aected by the lters.
• The soft-outbound parameter updates all outbound routes by applying the new or changed lters, but sends only the existing
routes aected by the new or changed lters to the neighbor.
Four-byte Autonomous System Numbers (AS4)
FastIron Ethernet Switch Layer 3 Routing
53-1003627-04 421
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