R1--------------Cat-1-----------------------Cat4
I configured ospf between R1 and Cat 4 on vlan 44, but after sometime they
were no longer neighbors.
and when tried to debug this, i found- cat 1 and cat 4 are root bridge for
vlan 44, but not for any other vlan,
and i have not configured any priority or root bridge preference.
config::
*CAT-1*
----------
*CAT1(config)#do sh cdp n | b D*
Device ID Local Intrfce Holdtme Capability Platform Port ID
BB1 Fas 1/0 146 R S I 3725 Fas 0/0
R2 Fas 1/2 132 R S I 3725 Fas 0/0
*CAT4 Fas 1/10 162 R S I 3725 Fas
1/10
CAT4 Fas 1/9 162 R S I 3725 Fas 1/9
*
*
VLAN44*
Spanning tree enabled protocol ieee
Root ID Priority 32768
* Address c209.2274.0006*
* This bridge is the root*
Hello Time 2 sec Max Age 20 sec Forward Delay 15 sec
Bridge ID Priority 32768
Address c209.2274.0006
Hello Time 2 sec Max Age 20 sec Forward Delay 15 sec
Aging Time 300
Interface Designated
Name Port ID Prio Cost Sts Cost Bridge ID Port
ID
-------------------- ------- ---- ----- --- ----- --------------------
-------
FastEthernet1/4 128.45 128 19 FWD 0 32768 c209.2274.0006
128.45
FastEthernet1/9 128.50 128 19 FWD 0 32768 c209.2274.0006
128.50
FastEthernet1/10 128.51 128 19 FWD 0 32768 c209.2274.0006
128.51
CAT1(config)#do sh spann vla *4 br*
*VLAN4*
Spanning tree enabled protocol ieee
Root ID Priority 32768
* Address c209.2274.0007
This bridge is the root*
Hello Time 2 sec Max Age 20 sec Forward Delay 15 sec
*CAT-4*
============================================================
CAT4(config)# do sh cdp n | b D
CAT3 Fas 1/13 138 R S I 3725 Fas 1/13
*CAT1 Fas 1/10 150 R S I 3725 Fas
1/10
CAT1 Fas 1/9 150 R S I 3725 Fas 1/9*
*CAT4*(config)#do sh spann* vlan 44 br*
VLAN44
Spanning tree enabled protocol ieee
Root ID Priority 32768
Address * c20e.1d14.0006*
* This bridge is the root*
Hello Time 2 sec Max Age 20 sec Forward Delay 15 sec
Interface Designated
Name Port ID Prio Cost Sts Cost Bridge ID Port
ID
-------------------- ------- ---- ----- --- ----- --------------------
-------
FastEthernet1/6 128.47 128 19 FWD 0 32768 c20e.1d14.0006
128.47
FastEthernet1/9 128.50 128 19 FWD 0 32768 c20e.1d14.0006
128.50
FastEthernet1/10 128.51 128 19 FWD 0 32768 c20e.1d14.0006
128.51
CAT4(config)#do sh spann* vlan 4 br*
*VLAN4*
Spanning tree enabled protocol ieee
Root ID Priority 32768
* Address c209.2274.0007
Cost 19
* * Port 50 (FastEthernet1/9)
* Hello Time 2 sec Max Age 20 sec Forward Delay 15 sec
Interface Designated
Name Port ID Prio Cost Sts Cost Bridge ID Port
ID
-------------------- ------- ---- ----- --- ----- --------------------
-------
FastEthernet1/6 128.47 128 19 FWD 19 32768 c20e.1d14.0007
128.47
FastEthernet1/9 128.50 128 19 FWD 0 32768 c209.2274.0007
128.50
FastEthernet1/10 128.51 128 19 *BLK 0 32768 c209.2274.0007 *
128.51
--
thanks
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