From: Alex Steer (alex.steer@eison.co.uk)
Date: Sat Nov 17 2007 - 11:02:58 ART
Nice one Joe,
I knew there would be some output you could use to find out what it is
without having to remember! (I had tried debugging but couldn't spot
anything useful) A quick double take at the difference and it's all
making sense!
Cheers
At which point do I receive the bill for your time?
-----Original Message-----
From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On Behalf Of
Joseph Brunner
Sent: 17 November 2007 13:50
To: Alex Steer; 'Cisco certification'
Subject: RE: protocol number ISL pvst
0x4242 is for ISL trunks (PVST)
Lsap 0x4242 for pvst (isl)
Lsap 0xaaaa for pvst+ (dot1q)
Just remember it this way, if you were going to be around, and not be
phased
out, what would your credit rating be? AAAA or 4242? LOL
You can also do "debug spanning-tree bpdu receive" to get the lsap type
you
need
(see this line regarding stp ENC)
5d14h: STP: enc 01 80 C2 00 00 00 00 15 2B 2C 7E 8E 00 26 42 42 03
In this debug message
5d14h: STP: VLAN0101 Po12:0000 00 00 00 606500152B2C7E80 00000000
606500152B2C7E80 8090 0000 1400 0200 0F00
5d14h: STP(101) port Po12 supersedes 0
5d14h: STP: VLAN0001 rx BPDU: config protocol = ieee, packet from
Port-channel12 , linktype IEEE_SPANNING , enctype 2, encsize 17
5d14h: STP: enc 01 80 C2 00 00 00 00 15 2B 2C 7E 8E 00 26 42 42 03
5d14h: STP: Data
0000000000600100152B2C7E8000000000600100152B2C7E8080900000140002
Of course this is an ISL trunk switch to Pvst+ (802.1q)
So I re-config'd po12 (member interfaces f0/13-14) to dot1q on both
sides,
and look now
5d14h: STP: VLAN0101 rx BPDU: config protocol = ieee, packet from
Port-channel12 , linktype SSTP , enctype 3, encsize 22
5d14h: STP: enc 01 00 0C CC CC CD 00 15 2B 2C 7E 8E 00 32 AA AA 03 00 00
0C
01 0B
5d14h: STP: Data
0000000001606500152B2C7E8000000000606500152B2C7E8080900000140002000F00
(see the AA AA)!!!
LOL, you only have "what you take in with you" and that is in your head
and
the CLI interface.
-Joe
-----Original Message-----
From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On Behalf Of
Alex
Steer
Sent: Saturday, November 17, 2007 7:11 AM
To: Cisco certification
Subject: protocol number ISL pvst
Hi
Does anyone know the protocol number for pvst over an isl trunk?
I can't seem to get spanning-tree to work with the following
configuration, fa0/8 is a trunk to another switch. The configuration
works fine if I change the a isl trunk into a dot1q trunk
mac access-list extended pvst
permit any any lsap 0xAAAA 0x0
mac access-list extended arp
permit any any 0x806 0x0
spanning-tree mode pvst
!
vlan access-map filter56 10
action forward
match ip address filter56
vlan access-map filter56 20
action forward
match mac address arp
vlan access-map filter56 30
action forward
match mac address pvst
vlan access-map filter56 40
action drop
!
vlan filter filter56 vlan-list 56
int fa0/8
swi trunk encap isl
This archive was generated by hypermail 2.1.4 : Sat Dec 01 2007 - 06:37:30 ART