From: sirus MOGHADASIAN (cyrus.mgh@gmail.com)
Date: Thu Aug 16 2007 - 15:04:25 ART
I have 2950 (port5,6)-----3550 (port 7,8) scenario, and I want to implement
mstp and load sharing between them.
I want to configure 2950 as a root for instance 1 and 3550 as a root for
instance 2
2950 config:
spanning-tree mst configuration
name MSTREG
revision 2
instance 1 vlan 3-5
instance 2 vlan 20-23
!
spanning-tree mst 1 priority 24576
C2950# sh spanning-tree
MST00
Spanning tree enabled protocol mstp
Root ID Priority 32768
Address 000d.651e.fd80
Cost 200000
Port 5 (FastEthernet0/5)
Hello Time 2 sec Max Age 20 sec Forward Delay 15 sec
Bridge ID Priority 32768 (priority 32768 sys-id-ext 0)
Address 000d.bdfa.6680
Hello Time 2 sec Max Age 20 sec Forward Delay 15 sec
Interface Role Sts Cost Prio.Nbr Type
---------------- ---- --- --------- --------
--------------------------------
Fa0/5 Root FWD 200000 128.5 P2p Bound(RSTP)
Fa0/6 Altn BLK 200000 128.6 P2p Bound(RSTP)
MST01
Spanning tree enabled protocol mstp
Root ID Priority 24577
Address 000d.bdfa.6680
This bridge is the root
Hello Time 2 sec Max Age 20 sec Forward Delay 15 sec
Bridge ID Priority 24577 (priority 24576 sys-id-ext 1)
Address 000d.bdfa.6680
Hello Time 2 sec Max Age 20 sec Forward Delay 15 sec
Interface Role Sts Cost Prio.Nbr Type
---------------- ---- --- --------- --------
--------------------------------
Fa0/5 Boun FWD 200000 128.5 P2p Bound(RSTP)
Fa0/6 Boun BLK 200000 128.6 P2p Bound(RSTP)
MST02
Spanning tree enabled protocol mstp
Root ID Priority 32770
Address 000d.bdfa.6680
This bridge is the root
Hello Time 2 sec Max Age 20 sec Forward Delay 15 sec
Bridge ID Priority 32770 (priority 32768 sys-id-ext 2)
Address 000d.bdfa.6680
Hello Time 2 sec Max Age 20 sec Forward Delay 15 sec
Interface Role Sts Cost Prio.Nbr Type
---------------- ---- --- --------- --------
--------------------------------
Fa0/5 Boun FWD 200000 128.5 P2p Bound(RSTP)
Fa0/6 Boun BLK 200000 128.6 P2p Bound(RSTP)
and 3550 config:
spanning-tree mode mst
spanning-tree extend system-id
!
spanning-tree mst configuration
name MSTREG
revision 2
instance 1 vlan 3-5
instance 2 vlan 20-23
!
3550#sh spanning-tree
MST0
Spanning tree enabled protocol mstp
Root ID Priority 32768
Address 000d.651e.fd80
This bridge is the root
Hello Time 2 sec Max Age 20 sec Forward Delay 15 sec
Bridge ID Priority 32768 (priority 32768 sys-id-ext 0)
Address 000d.651e.fd80
Hello Time 2 sec Max Age 20 sec Forward Delay 15 sec
Interface Role Sts Cost Prio.Nbr Type
---------------- ---- --- --------- --------
--------------------------------
Fa0/1 Desg FWD 200000 128.1 Edge P2p
Fa0/7 Desg FWD 200000 128.7 P2p
Fa0/8 Desg FWD 200000 128.8 P2p
Fa0/13 Desg FWD 200000 128.13 P2p
MST1
Spanning tree enabled protocol mstp
Root ID Priority 32769
Address 000d.651e.fd80
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 000d.651e.fd80
Hello Time 2 sec Max Age 20 sec Forward Delay 15 sec
Interface Role Sts Cost Prio.Nbr Type
---------------- ---- --- --------- --------
--------------------------------
Fa0/7 Desg FWD 200000 128.7 P2p
Fa0/8 Desg FWD 200000 128.8 P2p
MST2
Spanning tree enabled protocol mstp
Root ID Priority 32770
Address 000d.651e.fd80
This bridge is the root
Hello Time 2 sec Max Age 20 sec Forward Delay 15 sec
Bridge ID Priority 32770 (priority 32768 sys-id-ext 2)
Address 000d.651e.fd80
Hello Time 2 sec Max Age 20 sec Forward Delay 15 sec
Interface Role Sts Cost Prio.Nbr Type
---------------- ---- --- --------- --------
--------------------------------
Fa0/7 Desg FWD 200000 128.7 P2p
Fa0/8 Desg FWD 200000 128.8 P2p
the problem is as u see 2950 see 3550 bridge id but 3550 not see 29500
bridge id ,even more strange 2950 see itself as a root bridge for instance 1
but it's not put its port in forwarding state.
Why 3550 is not see 2950 as a root bridge for instance 1 ??? and why 2950
see itself as a root bridge but it's not put it's ports into forwarding
state???
any idea???
Thanks
This archive was generated by hypermail 2.1.4 : Sat Sep 01 2007 - 11:32:11 ART