Now I'm confused...

I have two 3560 48 port TS switches running 12.2.55.SE1 IP-Services. Both
switches are connected with port 13.

My goal is to have the ports in portfast mode and jump back to standard
learning, listening, and forwarding state after detecting a BPDU.

One vendor's material states that this can be accomplished by doing
"spanning-tree portfast bpdugaurd default" globally and then enabling
portfast on the interface. No dice, it goes straight to err-disable.

Another vendor's material states to do "spanning-tree portfast bpdufilter
default" globally and then do portfast on the interface. This seems to work
in the sense that it doesn't kill the port with err-disable. The problem is
the debugs and show spanning-tree never show the listening and learning
states.

SW1 and SW2 config:

global:
spanning-tree mode pvst
spanning-tree portfast bpdufilter default
spanning-tree extend system-id

under each port 13

spanning-tree portfast

Here's the debug output:

*Mar 1 00:29:27.907: Created spanning tree: VLAN0001 (5698310)
*Mar 1 00:29:27.907: Setting spanning tree MAC address: VLAN0001 (5698310)
to 001e.14cc.1100
*Mar 1 00:29:27.907: setting bridge id (which=3) prio 32769 prio cfg 32768
sysid 1 (on) id 8001.001e.14cc.1100
*Mar 1 00:29:27.907: STP PVST: Assigned bridge address of 001e.14cc.1100
for VLAN0001 [1] @ 5698310.
*Mar 1 00:29:27.907: Enabling spanning tree optimized bpdu tx for VLAN0001
(5698310)
*Mar 1 00:29:27.907: Starting spanning tree: VLAN0001 (5698310)
*Mar 1 00:29:27.907: set portid: VLAN0001 Fa0/13: new port id 800F
*Mar 1 00:29:27.907: Created spanning tree port Fa0/13 (460217C) for tree
VLAN0001 (5698310)
*Mar 1 00:29:27.907: STP: PVST vlan 1 port Fa0/13 created, ext id 4B65F48
*Mar 1 00:29:27.907: Enabling spanning tree port: FastEthernet0/13
(460217C)
*Mar 1 00:29:27.907: STP: VLAN0001 Fa0/13 ->jump to forwarding from
blocking <-----------------------------
*Mar 1 00:29:29.870: STP: VLAN0001 heard root 32769-001b.d53e.b700 on
Fa0/13
*Mar 1 00:29:29.870: supersedes 32769-001e.14cc.1100
*Mar 1 00:29:29.870: STP: VLAN0001 new root is 32769, 001b.d53e.b700 on
port Fa0/13, cost 19
*Mar 1 00:29:29.903: %LINK-3-UPDOWN: Interface FastEthernet0/13, changed
state to up
*Mar 1 00:29:29.903: Returning spanning tree port stats: FastEthernet0/13
(460217C)
*Mar 1 00:29:30.910: Returning spanning tree port stats: FastEthernet0/13
(460217C)
*Mar 1 00:29:30.910: %LINEPROTO-5-UPDOWN: Line protocol on Interface
FastEthernet0/13, changed state to up
*Mar 1 00:29:31.917: Returning spanning tree port stats: FastEthernet0/13
(460217C)
*Mar 1 00:29:32.923: Returning spanning tree port stats: FastEthernet0/13
(460217C)
*Mar 1 00:29:33.930: Returning spanning tree port stats: FastEthernet0/13
(460217C)
*Mar 1 00:29:34.937: Returning spanning tree port stats: FastEthernet0/13
(460217C)
*Mar 1 00:29:35.943: Returning spanning tree port stats: FastEthernet0/13
(460217C)
*Mar 1 00:29:36.950: Returning spanning tree port stats: FastEthernet0/13
(460217C)
*Mar 1 00:29:37.957: Returning spanning tree port stats: FastEthernet0/13
(460217C)
*Mar 1 00:30:09.926: STP: VLAN0001 we are the spanning tree root
*Mar 1 00:30:09.926: STP: VLAN0001 heard root 32769-001b.d53e.b700 on
Fa0/13
*Mar 1 00:30:09.926: supersedes 32769-001e.14cc.1100
*Mar 1 00:30:09.926: STP: VLAN0001 new root is 32769, 001b.d53e.b700 on
port Fa0/13, cost 19
*Mar 1 00:30:09.926: STP: VLAN0001 sent Topology Change Notice on Fa0/13
*Mar 1 00:30:37.960: Returning spanning tree port stats: FastEthernet0/13
(460217C)
*Mar 1 00:31:37.964: Returning spanning tree port stats: FastEthernet0/13
(460217C)

The debug clearly shows moving to forwarding from blocking. Then BPDUs are
heard and root port election/tcn takes place. At no time did the port go
into learning and listening state. What am I missing? I can't seem to find
the right combination to accomplish the goal.

TIA,

Mike

Blogs and organic groups at http://www.ccie.net
Received on Wed Jun 01 2011 - 20:12:37 ART