Avaya Configuring IP Exterior Gateway Protocols (BGP and EGP) Instrukcja Użytkownika Pobierz pdf (Strona 263)

Converting Cisco to Nortel Networks Equivalents

308628-15.0 Rev 00

B-7

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 contains “350 400

500” as specified by Cisco as-path access-list 5 and the Nortel Networks

policies 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, that is, 195.89.8.0 to 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 the Nortel

Networks global OSPF parameter, AS boundary Router, to “true” in the BCC

(“YES” in Site Manager) and disable BGP’s Intra-AS parameter.

14.

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

BCC protocol-source parameter or the Site Manager Route Source parameter

to OSPF and static in the router announce policy.

15.

The keepalive timer is used between BGP peers as a periodic check of the

TCP connection between them. The holddown timer is the amount of elapsed

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

of 30 and 90 seconds, respectively. Nortel Networks suggests that the

holddown timer be set to three times the amount of the keepalive timer.

16.

The Cisco loopback interface and the Nortel Networks circuitless (virtual) IP

interface are useful in BGP environments for peer interfaces.

17.

Enable subnet zero for interface addresses and routing updates.

18.

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

outside world sees a single AS, number 5, but the AS 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.

19.

Enables MD5 authentication on the TCP connection between the two BGP

peers (132.245.10.1 and 132.245.10.2). In this example, the MD5 key is

bla4u00=2nkq.

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