Avaya Configuring IP Exterior Gateway Protocols (BGP and EGP) Bedienungsanleitung PDF herunterladen (Seite 295)

Translating Cisco to Nortel Networks Equivalents

308628-14.00 Rev 00

C-7

Accept incoming advertisements from peer 1.1.1.1, of AS-Path that contain

either exactly AS 1000 or 5000 as specified by Cisco as-path access-list 5 and

Nortel Networks policy name IncomingRoutes.

Announce advertisements to peer 1.1.1.1 if the update includes an AS-Path

that matches <350 400> and deny updates of AS-Path that contain <350 400

500> as specified by Cisco as-path access-list 5 and Nortel Networks policy

names DenyAS and AllowAS.

10.

Create a peer group named MyPeers with the following elements: peer router

AS is 333, advertise networks as specified by route-map AdvertiseMap and

accept incoming networks as specified by FilterMap. Assign peer routers

1.1.1.1 and 2.2.2.2 to peer group MyPeers. Nortel Networks handles the peer

group concept by specifying the peer routers and AS in the similar

AdvertiseMap announce policy and FilterMap accept policy.

11.

Advertise the aggregate address 195.89.8.0 mask 255.255.248.0 (195.89.8.0/

21) as well as the more specific addresses i.e. 195.89.8.0 - 195.89.15.0.

12.

Advertise the aggregate address 195.89.8.0 mask 255.255.248.0 (195.89.8.0/

21) only.

13.

To redistribute BGP routes of AS 2000 into OSPF AS 101, set Nortel

Networks global OSPF parameter, AS boundary Router, to YES and disable

BGP’s Intra-AS parameter.

14.

To redistribute OSPF and routes of AS 101 into BGP AS 2000, set the Route

Source parameter to OSPF in the router announce policy.

15.

Keepalive timer is used between BGP peers as a periodic check of the TCP

connection between them. Holddown timer is the amount of elapsed time

before the BGP peering session is declared dead. RFC 1771 suggests values

of 30 and 90 seconds respectively. Holddown timer is suggested to be three

times the amount of the keepalive timer.

16.

Cisco’s loopback interface and Nortel Networks circuitless IP interface is

useful in BGP environments to use as peer interfaces.

17.

Enable the use of subnet zero for interface addresses and routing updates.

18.

Enable Confederations for IBGP full mesh reduction. In this example, the

outside world sees this as a single AS, number 5, but within the AS it is

divided into autonomous systems 4001, 4002, 4003 and 4004. This router's

confederation ID is 4001. It has a peer 1.2.3.4 within its routing

confederation domain and another peer 3.4.5.6 outside.

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