01-16-2014 11:04 PM - edited 03-07-2019 05:37 PM
Hi all,
im using 2960 24 port switch. it has rapid-pvst, i given uplink to SG-300 from G0/2.
the out put of Sh int trunk is given below.
Port Mode Encapsulation Status Native vlan
Fa0/22 on 802.1q trunking 1
Fa0/23 on 802.1q trunking 1
Fa0/24 on 802.1q trunking 1
Gi0/1 on 802.1q trunking 1
Gi0/2 on 802.1q trunking 1
Port Vlans allowed on trunk
Fa0/22 1-4094
Fa0/23 1-4094
Fa0/24 1-9,11-4094
Gi0/1 1-4094
Gi0/2 1-4094
Port Vlans allowed and active in management domain
Fa0/22 1-2,4-12,14-15,20,23-28,30-32,35,38,40,42,50-60,70,80,178,198-201,203-205
Fa0/23 1-2,4-12,14-15,20,23-28,30-32,35,38,40,42,50-60,70,80,178,198-201,203-205
Fa0/24 1-2,4-9,11-12,14-15,20,23-28,30-32,35,38,40,42,50-60,70,80,178,198-201,203-205
Gi0/1 1-2,4-12,14-15,20,23-28,30-32,35,38,40,42,50-60,70,80,178,198-201,203-205
Gi0/2 1-2,4-12,14-15,20,23-28,30-32,35,38,40,42,50-60,70,80,178,198-201,203-205
Port Vlans in spanning tree forwarding state and not pruned
Fa0/22 1-2,4-12,14-15,20,23-28,30-32,35,38,40,42,50-60,70,80,178,198-201,203-205
Fa0/23 1-2,4-12,14-15,20,23-28,30-32,35,38,40,42,50-60,70,80,178,198-201,203-205
Fa0/24 1-2,4-9,11-12,14-15,20,23-28,30-32,35,38,40,42,50-60,70,80,178,198-201,203-205
Gi0/1 1-2,4-12,14-15,20,23-28,30-32,35,38,40,42,50-60,70,80,178,198-201,203-205
Gi0/2 1-2,4-9,11-12,14-15,20,25-28,30-32,35,38,40,42,50-58,60,70,80,178,201,203
-------------------------------------------------------------------------------------------------------------------------------------------------
Here i have a doubt in Spannig tree forwarding state some vlans are not forwarded on Gi0/2
Why? and can i forwarde those vlans on gi0/2? how ?
Thanks
in advance
01-16-2014 11:20 PM
Hi,
Can you post sh spanning-tree vlan 10 output.
Regards
Alain
Don't forget to rate helpful posts.
01-17-2014 12:00 AM
Hi alain,
below is the spanning tree vlan 10,.. for security reseaons i removed mac--
VLAN0010
Spanning tree enabled protocol rstp
Root ID Priority 32778
Address
Cost 4
Port 25 (GigabitEthernet0/1)
Hello Time 2 sec Max Age 20 sec Forward Delay 15 sec
Bridge ID Priority 32778 (priority 32768 sys-id-ext 10)
Address
Hello Time 2 sec Max Age 20 sec Forward Delay 15 sec
Aging Time 300 sec
Interface Role Sts Cost Prio.Nbr Type
------------------- ---- --- --------- -------- ----------------------
Fa0/22 Desg FWD 19 128.22 P2p
Fa0/23 Desg FWD 19 128.23 P2p Peer(STP)
Gi0/1 Root FWD 4 128.25 P2p Peer(STP)
Gi0/2 Altn BLK 4 128.26 P2p Peer(STP)
thanks in advance
01-17-2014 12:17 AM
Hi,
Gi0/2 Altn BLK 4 128.26 P2p Peer(STP)
So you've got the answer for this vlan and I suspect it is the same for others.
Can you post your topology.
Regards
Alain
Don't forget to rate helpful posts.
01-17-2014 01:09 AM
Hello
See if these vlans highlighted are in the vtp database of this switch, Possible reason why you see the below output, is that there are being allowed on the trunk interface but don't exist.
Port Vlans allowed and active in management domain
Gi0/2 1-2,4-12,14-15,20,23-28,30-32,35,38,40,42,50-60,70,80,178,198-201,203-205
Port Vlans in spanning tree forwarding state and not pruned
Gi0/2 1-2,4-9,11-12,14-15,20,25-28,30-32,35,38,40,42,50-58,60,70,80,178,201,203
Sh vlan brief
res
Paul
Please don't forget to rate any posts that have been helpful.
Thanks.
01-17-2014 01:27 AM
Hi Paul,
As you can see from sh spanning-tree vlan 10 output this vlan 10 is in blocking mode(alternate port) so it does exist on the switch.
All vlans showed in upper output do exist on the switch and are active but they don't appear in lower output because they may be pruned(vtp pruning) or not in fwding state(stp) and here for vlan 10 this was the case and I think it must be the same for others.
Regards
Alain
Don't forget to rate helpful posts.
01-17-2014 04:58 AM
Hi paul and alain
my both switches are in RSTP MODE. but here SG-300 using RSTP and 2960 using rapid-pvst. its taking the spanning tree root on Gi0/1 for some vlans in 2960. Gi0/2 is up link to SG-300 , all vlans on the trunk.. but spanning-tree not forwarding those vlans on G0/2. can i root those vlan to gi0/2?
Port Vlans in spanning tree forwarding state and not pruned
Fa0/22 1-2,4-12,14-15,20,23-28,30-32,35,38,40,42,50-60,70,80,178,198-201,203-205
Fa0/23 1-2,4-12,14-15,20,23-28,30-32,35,38,40,42,50-60,70,80,178,198-201,203-205
Fa0/24 1-2,4-9,11-12,14-15,20,23-28,30-32,35,38,40,42,50-60,70,80,178,198-201,203-205
Gi0/1 1-2,4-12,14-15,20,23-28,30-32,35,38,40,42,50-60,70,80,178,198-201,203-205
Gi0/2 1-2,4-9,11-12,14-15,20,25-28,30-32,35,38,40,42,50-58,60,70,80,178,201,203
01-17-2014 05:30 AM
You don't want to set root for those vlans on that port.
Alain has asked what your topology is and that question needs answering because it might explain what is happening.
Is this the only link from SG-300 to the 2960 switch ?
Is that the only link from the new switch to any other switch in your setup ?
We need to understand how you have connected all the switches to understand why the link is blocking.
Jon
Discover and save your favorite ideas. Come back to expert answers, step-by-step guides, recent topics, and more.
New here? Get started with these tips. How to use Community New member guide