Configuring Redistribution
Configuring BGP
page 3-54
OmniSwitch AOS Release 7 Advanced Routing Configuration Guide
March 2011
Creating a Route Map
When a route map is created, it is given a name (up to 20 characters), a sequence number, and an action
(permit or deny). Specifying a sequence number is optional. If a value is not configured, then the default
value is used.
To create a route map, use the
ip route-map
command with the
action
parameter. For example,
-> ip route-map ospf-to-bgp sequence-number 10 action permit
The above command creates the ospf-to-bgp route map, assigns a
sequence number
of 10 to the route
map, and specifies a
permit
action.
To optionally filter routes before redistribution, use the
ip route-map
command with a
match
parameter
to configure match criteria for incoming routes. For example,
-> ip route-map ospf-to-bgp sequence-number 10 match tag 8
The above command configures a match statement for the ospf-to-bgp route map to filter routes based on
their tag value. When this route map is applied, only OSPF routes with a tag value of eight are redistrib-
uted into the BGP network. All other routes with a different tag value are dropped.
Note.
Configuring match statements is not required. However, if a route map does not contain any match
statements and the route map is applied using the
ip redist
command, the router redistributes
all
routes
into the network of the receiving protocol.
To modify route information before it is redistributed, use the
ip route-map
command with a
set
parame-
ter. For example,
-> ip route-map ospf-to-bgp sequence-number 10 set tag 5
The above command configures a set statement for the ospf-to-bgp route map that changes the route tag
value to five. Because this statement is part of the ospf-to-bgp route map, it is only applied to routes that
have an existing tag value equal to eight.
The following is a summary of the commands used in the above examples:
-> ip route-map ospf-to-bgp sequence-number 10 action permit
-> ip route-map ospf-to-bgp sequence-number 10 match tag 8
-> ip route-map ospf-to-bgp sequence-number 10 set tag 5
To verify a route map configuration, use the
show ip route-map
command:
-> show ip route-map
Route Maps: configured: 1 max: 200
Route Map: ospf-to-bgp Sequence Number: 10 Action permit
match tag 8
set tag 5