Switch User Manual

154 IP Routing Configuration and Management
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R4 is an OSPF internal router in Area 3.
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R5 is an internal OSPF stub router in Area 2.
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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-config command.
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
5.1 27 August 2007
Copyright © 2005-2007, Nortel Networks
.