154IP Routing Configuration and Management

R4 is an OSPF internal router in Area 3.

R5 is an internal OSPF stub router in Area 2.

All interfaces used for this configuration are ethernet, therefore the OSPF interfaces are broadcast.

The interface priority value on R5 is set to 0, therefore R5 cannot become a designated router (DR).

Configure the OSPF Router Priority so that R1 becomes the DR (priority of 100) and R2 becomes backup designated router (BDR) with a priority value of 50.

Stub and NSSA areas are used to reduce the LSDB size by excluding external LSAs. The stub ABR advertises a default route into the stub area for all external routes.

The following list outlines the commands used to create the illustrated configuration. A similar listing could be provided by using the show running-configcommand.

1.R1 configuration commands

!*** STP (Phase 1) *** ! spanning-tree stp 2 create spanning-tree stp 3 create spanning-tree cost-calc-mode dot1d spanning-tree port-mode normal spanning-tree stp 1 priority 8000 spanning-tree stp 1 hello-time 2 spanning-tree stp 1 max-age 20 spanning-tree stp 1 forward-time 15 spanning-tree stp 1 tagged-bpdu disable tagged-bpdu-vid 4001

spanning-tree stp 1 multicast-address 01:80:c2:00:00:00 spanning-tree stp 2 priority 8000

spanning-tree stp 2 hello-time 2 spanning-tree stp 2 max-age 20 spanning-tree stp 2 forward-time 15 spanning-tree stp 2 tagged-bpdu enable tagged-bpdu-vid 4002

spanning-tree stp 2 multicast-address 01:80:c2:00:00:00 spanning-tree stp 3 priority 8000

spanning-tree stp 3 hello-time 2 spanning-tree stp 3 max-age 20 spanning-tree stp 3 forward-time 15 spanning-tree stp 3 tagged-bpdu enable tagged-bpdu-vid 4003

spanning-tree stp 3 multicast-address 01:80:c2:00:00:00

!*** VLAN *** !

vlan configcontrol autopvid auto-pvid

Nortel Ethernet Routing Switch 5500 Series

Configuration-IP Routing Protocols

NN47200-503 03.01 Standard

5.127 August 2007

Copyright © 2005-2007, Nortel Networks

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Nortel Networks NN47200-503 manual IP Routing Configuration and Management