I am a little confused about the spanning tree state on an EX4200 VC, running 11.4R5.5.
{master:0} cjc@dmz4200> show spanning-tree bridge STP bridge parameters Context ID : 0 Enabled protocol : RSTP Root ID : 32768.88:e0:f3:77:53:81 Hello time : 2 seconds Maximum age : 20 seconds Forward delay : 15 seconds Message age : 0 Number of topology changes : 20 Time since last topology change : 3661899 seconds Topology change initiator : xe-0/1/0.0 Topology change last recvd. from : 88:e0:f3:74:51:6a Local parameters Bridge ID : 32768.88:e0:f3:77:53:81 Extended system ID : 0 Internal instance ID : 0 {master:0} cjc@dmz4200> show spanning-tree interface Spanning tree interface parameters for instance 0 Interface Port ID Designated Designated Port State Role port ID bridge ID Cost ge-0/0/0.0 128:513 128:513 32768.88e0f3775381 20000 FWD DESG ge-0/0/47.0 128:560 128:560 32768.88e0f3775381 20000 FWD DESG xe-0/1/0.0 128:609 128:609 32768.88e0f3775381 2000 FWD ROOT xe-0/1/2.0 128:611 128:611 32768.88e0f3775381 2000 FWD DESG ge-1/0/0.0 128:625 128:625 32768.88e0f3775381 20000 FWD DESG ge-1/0/47.0 128:672 128:672 32768.88e0f3775381 20000 FWD DESG xe-1/1/0.0 128:721 128:776 32768.50c58dac4c81 2000 BLK ALT xe-1/1/2.0 128:723 128:723 32768.88e0f3775381 2000 FWD DESG So what I'm confused about is that the "show spanning-tree bridge" output says that this switch is the root bridge, yet the per-interface output indicates that there are ROOT and ALT ports. Also, the bridge ID for the ROOT port is the switch itself? Whereas the ALT port is what I would expect, except that it again seems to contradict the idea that this switch is the root bridge. I think my RSTP on this switch is in some messed up state? When I turn on traceoptions for rstp, I see sucpicious stuff like, Oct 2 11:26:59.532378 PISM: Port xe-1/1/0.0: IMPOSSIBLE EVENT/STATE Combination Occured Oct 2 11:26:59.532396 PISM: Event routine returned FAILURE Oct 2 11:26:59.532414 MSG: RstPortInfoMachine function returned FAILURE! Oct 2 11:26:59.532441 RECV: PortReceiveStateMachine Action returned FAILURE! Oct 2 11:26:59.532467 MSG: RstPortReceiveMachine function returned FAILURE! Oct 2 11:26:59.532493 MSG: RstHandleInBpdu function FAILED! Is there a low risk way to reset RSTP on a production switch? _______________________________________________ juniper-nsp mailing list juniper-nsp@puck.nether.net https://puck.nether.net/mailman/listinfo/juniper-nsp