Avaya Configuring IP Exterior Gateway Protocols (BGP and EGP) Instrukcja Użytkownika Pobierz pdf (Strona 153)

Configuring Route and Traffic Balancing

308628-15.0 Rev 00

7-3

Now consider that BGP on router F receives advertisements to three destinations

(destination_1, destination_2, and destination_3) from its peer on router A. For

each of these destinations, BGP consults the IP routing table to determine the next

OSPF hop.

If you configure BGP on router F for IBGP ECMP route balancing, BGP submits

one BGP route to the routing table for each BGP destination, using in round-robin

fashion the available OSPF ECMP routes, as follows:

BGP submits a route to destination_1 and specifies interface 1 (the interface

to router D) as the next hop.

BGP submits a route to destination_2 and specifies interface 4 (the interface

to router C) as the next hop.

BGP submits a BGP route to destination_3 and specifies interface 1 as the

next hop.

Figure 7-2

shows the three route-balancing BGP ECMP entries to the routing

table on router F.

Destination/Mask Proto Age Cost Next Hop AS

..................................................................

destination_1 BGP-4 577438 126992 F-1 764

destination_2 BGP-4 577438 126992 F-4 764

destination_3 BGP-4 577438 126992 F-1 764

Figure 7-2. IBGP ECMP Route Balancing

If you configure BGP for traffic balancing, BGP submits multiple BGP routes,

one for each OSPF ECMP route, as follows:

BGP submits two IP routes to destination_1. One route specifies interface 1;

the second route specifies interface 4.

BGP submits two IP routes to destination_2. One route specifies interface 1;

the second route specifies interface 4.

BGP submits two IP routes to destination_3. One route specifies interface 1;

the second route specifies interface 4.

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Avaya Configuring IP Exterior Gateway Protocols (BGP and EGP) Instrukcja Użytkownika Strona 153