Brocade Communications Systems Layer 3 Routing Configuration ICX 6650 - Manual (Page 368)

350 Brocade ICX 6650 Layer 3 Routing Configuration Guide
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Filtering
Deleting a community from a BGP4 route
To delete a community from a BGP4 route community attributes field, enter commands such as the
following.
Brocade(config)#ip community-list standard std_3 permit 12:99 12:86
Brocade(config)#route-map bgp6 permit 1
Brocade(config-routemap bgp6)#match ip address 1
Brocade(config-routemap bgp6)#set comm-list std_3 delete
The first command configures a community ACL containing community numbers 12:99 and 12:86.
The remaining commands configure a route map that matches on routes whose destination
network is specified in ACL 1, and deletes communities 12:99 and 12:86 from those routes. The
route does not need to contain all the specified communities in order for them to be deleted. For
example, if a route contains communities 12:86, 33:44, and 66:77, community 12:86 is deleted.
Syntax: set comm-list ACL delete
The ACL parameter specifies the name of a community list ACL.
Using a table map to set the tag value
Route maps that contain set statements change values in routes when the routes are accepted by
the route map. For inbound route maps (route maps that filter routes received from neighbors), this
means that the routes are changed before they enter the BGP4 route table.
For tag values, if you do not want the value to change until a route enters the IP route table, you can
use a table map to change the value. A table map is a route map that you have associated with the
IP routing table. The Layer 3 switch applies the set statements for tag values in the table map to
routes before adding them to the route table.
To configure a table map, you configure the route map, then identify it as a table map. The table
map does not require separate configuration. You create it simply by calling an existing route map a
table map. You can have one table map.
NOTE
Use table maps only for setting the tag value. Do not use table maps to set other attributes. To set
other route attributes, use route maps or filters.
To create a route map and identify it as a table map, enter commands such as following. These
commands create a route map that uses an address filter. For routes that match the address filter,
the route map changes the tag value to 100. This route map is then identified as a table map. As a
result, the route map is applied only to routes that the Layer 3 switch places in the IP route table.
The route map is not applied to all routes. This example assumes that address filter 11 has already
been configured.
Brocade(config)#route-map TAG_IP permit 1
Brocade(config-routemap TAG_IP)#match address-filters 11
Brocade(config-routemap TAG_IP)#set tag 100
Brocade(config-routemap TAG_IP)#router bgp
Brocade(config-bgp-router)#table-map TAG_IP