Hi,
assume that you have 5 vlans created on 6509, exactely the same configuration should be running on the the 3550, only the switch IP address & the vlan interface ip address should be different. where the standby ip should be the same on both the vlan interface of 6509 & 3550. you may also have a doubt that how 1 becomes the main & other becomes the standby. when you run HSRP, actually both the switches are active, which means the 3550 is also running same as 6509, when ever 6509 fails, immediately, within few seconds of delay in my test lab it took 8 seconds(juz to learn the MAC address everything)3550 will become the active switch. this is based on the priority of the switch configured on the vlan interface. here is now to configure one as an active switch & the other as the standby switch.
Physcial connectivity as follows
edge-1 -----> 6509
edge-1 -----> 3550
6509 -----> 3550
all these ports should be trunked.
on 6509
switch
set interface sc0 5 10.1.1.1/255.255.255.0 10.1.1.255
MSFC2(layer 3 module)
interface vlan 2
description ***Server Farm***
ip address 10.1.1.254 255.255.255.0
standby 1 ip 10.1.1.252 255.255.255.0
standby 1 timers 5 15
standby 1 priority 110
standby 1 preempt
interface vlan 3
description ***Marketing Department***
ip address 10.2.1.254 255.255.255.0
standby 2 ip 10.2.1.252 255.255.255.0
standby 2 timers 5 15
standby 2 priority 110
standby 2 preempt
on 3550
switch
interface vlan 2
description ***Server Farm***
ip address 10.1.1.253 255.255.255.0
standby 1 ip 10.1.1.252 255.255.255.0
standby 1 timers 5 15
standby 1 priority 109
standby 1 preempt
interface vlan 3
description ***Marketing Department***
ip address 10.2.1.253 255.255.255.0
standby 2 ip 10.2.1.252 255.255.255.0
standby 2 timers 5 15
standby 2 priority 109
standby 2 preempt
here you can see that the priority valvue is less on 3550,based on this value active & standby will be decided.
now in the client & server side, make the gateway ip address as the virtual IP. ie. for servers the gateway IP address should 10.1.1.252 & for the markerting pc's it should be 10.2.1.252.
which means even if 6509 interface vlan 2 fails this 10.2.1.252 virtual IP will act as 10.2.1.253
Note: HSRP between the switches (6509 & 3550) will communicate via Multicast, so when you implement access list make sure that you permitting the multicast IP address 224.0.0.2 for HSRP, if it is not permitted HSRP will not work.
hope this helps.
rate this post if cleared.
