Dell BigIron RX Series, Configuration Manual

Page: 884 / 1458

808 BigIron RX Series Configuration Guide
53-1002253-01
Filtering
26
BigIron RX(config)# access-list 1 permit 192.168.9.0 0.0.0.255
BigIron RX(config)# route-map bgp4 permit 1
BigIron RX(config-routemap bgp4)# match ip address 1
BigIron RX(config-routemap bgp4)# set metric-type internal
The first command configures an ACL that matches on routes with destination network
192.168.9.0. The remaining commands configure a route map that matches on the destination
network in ACL 1, then sets the metric type for those routes to the same value as the IGP metric of
the BGP4 next-hop route.
Syntax: set metric-type internal
Setting the next hop of a BGP4 route
To set the next hop address of a BGP4 route to a neighbor address, enter commands such as the
following.
BigIron RX(config)# route-map bgp5 permit 1
BigIron RX(config-routemap bgp5)# match ip address 1
BigIron RX(config-routemap bgp5)# set ip next-hop peer-address
These commands configure a route map that matches on routes whose destination network is
specified in ACL 1, and sets the next hop in the routes to the neighbor address (inbound filtering) or
the local IP address of the BGP4 session (outbound filtering).
Syntax: set ip next-hop peer-address
The value that the software substitutes for peer-address depends on whether the route map is
used for inbound filtering or outbound filtering:
•
When you use the set ip next-hop peer-address command in an inbound route map filter,
peer-address substitutes for the neighbor’s IP address.
•
When you use the set ip next-hop peer-address command in an outbound route map filter,
peer-address substitutes for the local IP address of the BGP4 session.
NOTE
You can use this command for a peer group configuration.
Deleting a community from a BGP4 route
To delete a community from a BGP4 route’s community attributes field, enter commands such as
the following.
BigIron RX(config)# ip community-list standard std_3 permit 12:99 12:86
BigIron RX(config)# route-map bgp6 permit 1
BigIron RX(config-routemap bgp6)# match ip address 1
BigIron RX(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.