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VLAN interoperability between Cisco and Foundry

I have a Cisco 2960 trunked to a Foundry switch. I have configured the trunk on the Cisco as follows:

rs-b3.ott26#sh int gi0/1 switchport

Name: Gi0/1

Switchport: Enabled

Administrative Mode: trunk

Operational Mode: trunk

Administrative Trunking Encapsulation: dot1q

Operational Trunking Encapsulation: dot1q

Negotiation of Trunking: On

Access Mode VLAN: 1 (default)

Trunking Native Mode VLAN: 1 (default)

Administrative Native VLAN tagging: enabled

Voice VLAN: none

Administrative private-vlan host-association: none

Administrative private-vlan mapping: none

Administrative private-vlan trunk native VLAN: none

Administrative private-vlan trunk Native VLAN tagging: enabled

Administrative private-vlan trunk encapsulation: dot1q

Administrative private-vlan trunk normal VLANs: none

Administrative private-vlan trunk private VLANs: none

Operational private-vlan: none

Trunking VLANs Enabled: ALL

Pruning VLANs Enabled: 2-1001

Capture Mode Disabled

Capture VLANs Allowed: ALL

Protected: false

Unknown unicast blocked: disabled

Unknown multicast blocked: disabled

Appliance trust: none

On the Foundry, I have tagged all the VLAN's that are to be trunked over to the Cisco. However, when I do a sh span-tree I get the following output reporting that some of the VLAN's are broken. I have configured all the VLAN's the same way.

VLAN0001

Spanning tree enabled protocol ieee

Root ID Priority 32769

Address 001a.6d4c.5180

This bridge is the root

Hello Time 2 sec Max Age 20 sec Forward Delay 15 sec

Bridge ID Priority 32769 (priority 32768 sys-id-ext 1)

Address 001a.6d4c.5180

Hello Time 2 sec Max Age 20 sec Forward Delay 15 sec

Aging Time 300

Interface Role Sts Cost Prio.Nbr Type

---------------- ---- --- --------- -------- --------------------------------

Gi0/1 Desg BKN*4 128.25 P2p *PVID_Inc

VLAN0049

Spanning tree enabled protocol ieee

Root ID Priority 32817

Address 001a.6d4c.5180

This bridge is the root

Hello Time 2 sec Max Age 20 sec Forward Delay 15 sec

Bridge ID Priority 32817 (priority 32768 sys-id-ext 49)

Address 001a.6d4c.5180

Hello Time 2 sec Max Age 20 sec Forward Delay 15 sec

Aging Time 300

Interface Role Sts Cost Prio.Nbr Type

---------------- ---- --- --------- -------- --------------------------------

Gi0/1 Desg BKN*4 128.25 P2p *PVID_Inc

VLAN0061

Spanning tree enabled protocol ieee

Root ID Priority 32829

Address 001a.6d4c.5180

This bridge is the root

Hello Time 2 sec Max Age 20 sec Forward Delay 15 sec

Bridge ID Priority 32829 (priority 32768 sys-id-ext 61)

Address 001a.6d4c.5180

Hello Time 2 sec Max Age 20 sec Forward Delay 15 sec

Aging Time 300

Interface Role Sts Cost Prio.Nbr Type

---------------- ---- --- --------- -------- --------------------------------

Gi0/1 Desg BKN*4 128.25 P2p *PVID_Inc

1 REPLY
Bronze

Re: VLAN interoperability between Cisco and Foundry

Are both your devices using the same STP model, or is one doing Per Vlan STP and the other doing Mono STP? Also, are you doing regular or rapid spanning tree? Same on both devices?

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