Nortel Networks WEB OS 212777 - Manual (Page 276)

Web OS 10.0 Application Guide
276 n Chapter 11: High Availability
212777-A, February 2002
By reducing complexity to a single subnet and not requiring routing (L3), hot-standby can be
used. The key to hot-standby is that the interswitch link (the link between switches), does NOT
participate in STP, so there are no loops in the topology (see
Figure 11-10 ). STP does not need to
be enabled, and the switch will have failover times similar to what would be the case with VRRP.
Configuration Procedure
Configuration takes place after configuring SLB and VRRP with STP enabled:
1. From the SLB menu, enable a hot-standby link on the Layer 4 ports; then enable inter-
switch link on the crosslink.
2. From the VRRP menu, enable VRRP group mode; then enable hot-standby.
3. Sync the VRRP, SLB, and filter settings to the other switch (same ports).
N OTE – Switches peering with each other must have an equal number of ports.
4. Turn off STP after verifying that the network is stable.
N OTE – You must reboot the switch for the hot-standby configuration to take effect.
>> Main# /cfg/slb/port 1 (Select port 1)
>> SLB Port 1# server ena (Enable the server)
>> SLB Port 1# hotstan ena (Enable hot standby)
>> SLB Port 1# ../port 3 (Select port 3)
>> SLB Port 3# intersw ena (Enable inter-switch processing)
>> SLB Port 3# ../port 7 (Select port 7)
>> SLB Port 7# client ena (Enable the client)
>> SLB Port 7# hotstan ena (Enable hot standby)
>> Main# /cfg/vrrp/on (Enable VRRP)
>> VRRP# hotstan ena (Enable hot standby)
>> VRRP# group ena (Enable VR group)
>> Main# /oper/slb/sync
>> Main# /cfg/stp 1/off (Disable STP group)
>> Spanning Tree Group 1# save (Enable hot standby)
>> Main# /boot/reset (Reset the switch)