Take a look at "show int trunk" and make sure you're trunking the correct VLANs between the switches.
In my experience multiple switches claiming to be the root means that you've misconfigured a trunk somewhere. Jon. On 10 January 2012 07:47, gaurav <[email protected]> wrote: > 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 > _______________________________________________ > For more information regarding industry leading CCIE Lab training, please > visit www.ipexpert.com > > Are you a CCNP or CCIE and looking for a job? Check out > www.PlatinumPlacement.com <http://www.platinumplacement.com/> > > http://onlinestudylist.com/mailman/listinfo/ccie_rs > _______________________________________________ For more information regarding industry leading CCIE Lab training, please visit www.ipexpert.com Are you a CCNP or CCIE and looking for a job? Check out www.PlatinumPlacement.com http://onlinestudylist.com/mailman/listinfo/ccie_rs
