
Configuring IP Exterior Gateway Protocols (BGP and EGP)
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To establish a peer-to-peer session between router A and router B:
1.
Choose a numbered interface on each router for the peer-to-peer session.
Note the network/subnet that each interface is on.
In Figure 6-2
, router A has a numbered interface to network 1. Router B has a
numbered interface to network 3. The network administrator has chosen these
two interfaces to support the peer-to-peer session.
2.
If the two routers are in different ASs, enable multihop EBGP
connections.
(See “Enabling Multihop Connections” on page 5-11
.)
3.
If no interior gateway protocol (RIP or OSPF) is running over the
unnumbered link, configure a static route on each router to the other
router’s network and subnet.
Because the routers do not share a numbered subnet, each BGP peer needs to
know a route to the network/subnet of the interface that the other BGP peer
uses. If there is an IGP protocol (RIP or OSPF) running over the unnumbered
link, RIP or OSPF will learn the route and store it in the routing table.
Otherwise, you need to configure a static route on each router to the other
BGP peer’s network/subnet. The route should point to the unnumbered link.
4.
Configure the BGP connection on each router.
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