Avaya Configuring IP Exterior Gateway Protocols (BGP and EGP) Bedienungsanleitung PDF herunterladen (Seite 294)

Configuring IP Exterior Gateway Protocols (BGP and EGP)

C-6

308628-14.00 Rev 00

Interpreting the Cisco to Nortel Networks BGP Translation

Table

The numbers in the following list correspond to the item numbers in Table C-1.

Each numbered item in this list describes the function of the commands in the

corresponding row of that table.

Enable the Border Gateway Protocol (BGP) routing process and identify the

local router autonomous system (AS), 333. Activate a BGP session with peer

router, IP address, 1.1.1.2 which belongs to AS 444. If the local and remote

AS numbers are the same, the BGP session is internal, otherwise it is an

external BGP session. Note that Nortel Networks also requires definition of

the local router IP address, 1.1.1.1, and “Local Address”, which are the same.

Advertise network 1.1.1.0 mask 255.255.255.0 and originate it from my AS.

Note that network 1.1.1.0 must be present in the IP routing table for Cisco’s

BGP network command to advertise the route.

Accept incoming advertisement of network 128.1.0.0, mask 255.255.0.0 from

peer IP address, 1.1.1.1, as specified by Cisco access list 5 or Nortel Networks

policy name IncomingRoutes.

Announce advertisement of network 195.89.32.0 mask 255.255.224.0 to peer

IP address, 1.1.1.1, as specified by Cisco access list 10 or Nortel Networks

policy name OutgoingRoutes.

Accept incoming advertisements, from peer 1.1.1.1, match on AS-Path that

contain either AS “333 444” or 345 and set Local Preference to 125, as

specified by Cisco route-map and Nortel Networks policy name

IncomingMap.

Announce advertisements to peer 1.1.1.1 and append AS-Path <123 123> to

all outgoing updates, as specified by Cisco route-map and Nortel Networks

policy name setASPath. Note: If on Nortel Networks one uses “as-path”

instead of "as-path-prepend", the AS-Path is replaced instead of appended to.

Announce advertisement of network 192.10.20.0 mask 255.255.255.0 to peer

IP address 1.1.1.1, setting multi-exit discriminator (MED) to 100 as specified

by Cisco route-map and Nortel Networks policy name AdvertiseMap. In

addition, advertise any other networks with MED set to 50. Nortel Networks

definition requires 2 separate announce policies with the more specific

network advertised given the higher rule precedence.

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Avaya Configuring IP Exterior Gateway Protocols (BGP and EGP) Bedienungsanleitung Seite 294