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hsrp and spanning tree

I have the setup below (see pic). I have core 1 as the primary hsrp gateway for vlan24 10.2.24.1/24 and core 2 as the primary hsrp gateway for vlan120 10.2.120.1/24. But when I look at the spanning tree, it is all going through core1 because spanning tree blocks fa0/2 for both vlans on switch1. How do I fix this to allow fa0/1 as the primary path for vlan24 and fa0/1 as the primary path for vlan120.

Rafael

Can you provide more details like a config for core 1, core 2 as well as what type of switches they are ?

leblanc

ASKER

The cores are Cisco Catalyst 3750s. Switch0 is a Cisco Catalyst 2960S. The configs are very basic (see below)

switch1:

...
interface FastEthernet0/1
 switchport mode trunk
!
interface FastEthernet0/2
 switchport mode trunk
!
...
!
interface Vlan1
 no ip address
!
interface Vlan120
 ip address 10.2.120.100 255.255.255.0
...
ip default-gateway 10.2.120.1

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core1:

interface gig0/0
 switchport mode trunk
!
interface gig0/2
 switchport mode trunk
!
...
interface Vlan1
 no ip address
!
interface Vlan24
 ip address 10.2.24.2 255.255.255.0
 standby 1 ip 10.2.24.1
 standby 1 priority 200
 standby 1 preempt
!
interface Vlan120
 ip address 10.2.120.2 255.255.255.0
 standby 1 ip 10.2.120.1
 standby 1 preempt
...

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core2:

interface gig0/0
 switchport mode trunk
!
interface gig0/2
 switchport mode trunk
!
...
interface Vlan1
 no ip address
!
interface Vlan24
 ip address 10.2.24.2 255.255.255.0
 standby 1 ip 10.2.24.1
 standby 1 preempt
!
interface Vlan120
 ip address 10.2.120.2 255.255.255.0
 standby 1 ip 10.2.120.1
  standby 1 priority 200
 standby 1 preempt
...

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SH SPAN FROM SWITCH0:

 VLAN24 is executing the ieee compatible Spanning Tree protocol
  Bridge Identifier has priority 32768, address cc03.1e68.0001
  Configured hello time 2, max age 20, forward delay 15
  Current root has priority 32768, address cc01.1cd4.0001
  Root port is 41 (FastEthernet0/1), cost of root path is 19
  Topology change flag not set, detected flag not set
  Number of topology changes 3 last change occurred 01:57:36 ago
          from FastEthernet0/2
  Times:  hold 1, topology change 35, notification 2
          hello 2, max age 20, forward delay 15
  Timers: hello 0, topology change 0, notification 0, aging 300

 Port 41 (FastEthernet0/1) of VLAN24 is forwarding
   Port path cost 19, Port priority 128, Port Identifier 128.41.
   Designated root has priority 32768, address cc01.1cd4.0001
   Designated bridge has priority 32768, address cc01.1cd4.0001
   Designated port id is 128.81, designated path cost 0
   Timers: message age 1, forward delay 0, hold 0
   Number of transitions to forwarding state: 1
   BPDU: sent 30, received 4306

 Port 42 (FastEthernet0/2) of VLAN24 is blocking
   Port path cost 19, Port priority 128, Port Identifier 128.42.
   Designated root has priority 32768, address cc01.1cd4.0001
   Designated bridge has priority 32768, address cc02.173c.0001
   Designated port id is 128.81, designated path cost 19
   Timers: message age 3, forward delay 0, hold 0
   Number of transitions to forwarding state: 1
   BPDU: sent 16, received 4316


VLAN120 is executing the ieee compatible Spanning Tree protocol
  Bridge Identifier has priority 32768, address cc03.1e68.0002
  Configured hello time 2, max age 20, forward delay 15
  Current root has priority 32768, address cc01.1cd4.0002
  Root port is 41 (FastEthernet0/1), cost of root path is 19
  Topology change flag not set, detected flag not set
  Number of topology changes 3 last change occurred 01:59:52 ago
          from FastEthernet0/2
  Times:  hold 1, topology change 35, notification 2
          hello 2, max age 20, forward delay 15
  Timers: hello 0, topology change 0, notification 0, aging 300

 Port 41 (FastEthernet0/1) of VLAN120 is forwarding
   Port path cost 19, Port priority 128, Port Identifier 128.41.
   Designated root has priority 32768, address cc01.1cd4.0002
   Designated bridge has priority 32768, address cc01.1cd4.0002
   Designated port id is 128.81, designated path cost 0
   Timers: message age 1, forward delay 0, hold 0
   Number of transitions to forwarding state: 1
   BPDU: sent 30, received 4371

 Port 42 (FastEthernet0/2) of VLAN120 is blocking
   Port path cost 19, Port priority 128, Port Identifier 128.42.
   Designated root has priority 32768, address cc01.1cd4.0002
   Designated bridge has priority 32768, address cc02.173c.0002
   Designated port id is 128.81, designated path cost 19
   Timers: message age 3, forward delay 0, hold 0
   Number of transitions to forwarding state: 1
   BPDU: sent 17, received 4380

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ASKER CERTIFIED SOLUTION

Don Johnston

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leblanc

ASKER

Yes. That's it. Thx