Extreme Networks ExtremeWare XOS 11.1, Manual

Page: 404 / 496

Exterior Gateway Routing Protocols
ExtremeWare XOS 11.1 Concepts Guide
404
enable ipforwarding vlan ed
configure ospf add vlan ed area 0.0.0.0
enable ospf
configure bgp as-number 65002
configure bgp routerid 192.1.1.13
configure bgp confederation-id 200
enable bgp
create bgp neighbor 192.1.1.14 remote-AS-number 65002
enable bgp neighbor 192.1.1.14
Route Aggregation
Route aggregation is the process of combining the characteristics of several routes so that they are
advertised as a single route. Aggregation reduces the amount of information that a BGP speaker must
store and exchange with other BGP speakers. Reducing the information that is stored and exchanged
also reduces the size of the routing table.
Using Route Aggregation
To use BGP route aggregation:
1 Enable aggregation using the following command:
enable bgp aggregation
2 Create an aggregate route using the following command:
configure bgp add aggregate-address {address-family [ipv4-unicast | ipv4-
multicast]} <ipaddress> {as-match | as-set} {summary-only} {advertise-policy
<policy>} {attribute-policy <policy>}
Using the Loopback Interface
If you are using BGP as your IGP, you may decide to advertise the interface as available, regardless of
the status of any particular interface. The loopback interface can also be used for EBGP multihop. Using
the loopback interface eliminates multiple, unnecessary route changes.
BGP Peer Groups
You can use BGP peer groups to group together up to 512 BGP neighbors. All neighbors within the peer
group inherit the parameters of the BGP peer group. The following mandatory parameters are shared
by all neighbors in a peer group:
●
remote AS
●
source-interface
●
route-policy
●
send-community
●
next-hop-self