Avaya Configuring IP Services Manual de usuario Pagina 357

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Configuring and Customizing BGP
303528-A Rev 00
8-89
Enabling and Disabling IBGP Equal-Cost Multipath
BGP equal-cost multipath (ECMP) support allows an IBGP speaker to perform
route balancing within an AS by using multiple equal-cost routes submitted to the
routing table by OSPF or RIP.
Consider the AS topology in Figure 8-6
. BGP is the external gateway protocol; the
internal gateway protocol is OSPF. All OSPF and IBGP speakers are configured
for ECMP. IP, using a routing table consisting of OSPF routes, has set up a
peer-to-peer session between the IBGP speaker in router A and the IBGP speaker
in router D. The following events occur:
1. Router A advertises an external route to router D over the peer-to-peer
session.
2. Router D determines that the IBGP next hop (router A) is not on a directly
connected network.
3. Router D examines the IP routing table for a route to router A.
4. Router D discovers that the IP routing table contains two ECMP routes to
router A. For the first route, the IP next hop is router B. For the second route,
the IP next hop is router C.
5. Router D chooses router B as the IP next hop for the route advertised by router
A and submits the route to the IP routing table. If router A advertises another
external route, router D submits the route through router C. If router A
continues to advertise external routes, router D alternates between the two
ECMP routes in round-robin fashion.
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