From: Victor Cappuccio (victor@ccbootcamp.com)
Date: Fri Jun 08 2007 - 19:02:07 ART
Hi Michael,
Can you elaborate a little bit more please this?
I have configured the following
Sw2#show vtp status
VTP Version : 2
Configuration Revision : 0
Maximum VLANs supported locally : 1005
Number of existing VLANs : 6
VTP Operating Mode : Transparent
VTP Domain Name : cisco
VTP Pruning Mode : Disabled
VTP V2 Mode : Disabled
VTP Traps Generation : Disabled
MD5 digest : 0xBE 0xF6 0xE5 0xB3 0x96 0x2C 0x86 0xEB
Configuration last modified by 10.10.8.8 at 3-3-93 05:27:43
Sw2#
rack5>7
[Resuming connection 7 to sw1 ... ]
Sw1(config)#do show vtp status
VTP Version : 2
Configuration Revision : 0
Maximum VLANs supported locally : 1005
Number of existing VLANs : 14
VTP Operating Mode : Server
VTP Domain Name : cisco
VTP Pruning Mode : Disabled
VTP V2 Mode : Disabled
VTP Traps Generation : Disabled
MD5 digest : 0x26 0x18 0xF2 0x00 0xB5 0x36 0xA4 0x7A
Configuration last modified by 10.10.34.7 at 3-1-93 22:16:15
Local updater ID is 10.10.34.2 on interface Vl200 (lowest numbered VLAN
interface found)
Sw1(config)#vtp prun
Pruning switched on
Sw1(config)#do show vtp status
VTP Version : 2
Configuration Revision : 1
Maximum VLANs supported locally : 1005
Number of existing VLANs : 14
VTP Operating Mode : Server
VTP Domain Name : cisco
VTP Pruning Mode : Enabled
VTP V2 Mode : Disabled
VTP Traps Generation : Disabled
MD5 digest : 0xF4 0xF8 0x17 0x2E 0xCA 0x4D 0x80 0x9B
Configuration last modified by 10.10.34.2 at 3-2-93 16:01:24
Local updater ID is 10.10.34.2 on interface Vl200 (lowest numbered VLAN
interface found)
So I enabled pruning and lets see what the sw2 has
Sw1(config)#
rack5>8
[Resuming connection 8 to sw2 ... ]
3d21h: VTP LOG RUNTIME: Relaying packet received on trunk Fa0/19 - in
TRANSPARENT MODE (nc = false)
3d21h: VTP LOG RUNTIME: Relaying packet received on trunk Fa0/19 -
Sw2#do sho
3d21h: VTP LOG RUNTIME: Relaying packet received on trunk Fa0/20 - in
TRANSPARENT MODE (nc = false)
3d21h: VTP LOG RUNTIME: Relaying packet received on trunk Fa0/19 - in
TRANSPARENT MODE (nc = false)
Sw2#show vtp stat
VTP Version : 2
Configuration Revision : 0
Maximum VLANs supported locally : 1005
Number of existing VLANs : 6
VTP Operating Mode : Transparent
VTP Domain Name : cisco
VTP Pruning Mode : Disabled
VTP V2 Mode : Disabled
VTP Traps Generation : Disabled
MD5 digest : 0xBE 0xF6 0xE5 0xB3 0x96 0x2C 0x86 0xEB
Configuration last modified by 10.10.8.8 at 3-3-93 05:27:43
Sw2
VTP Prunning is disabled yet!
By
http://www.cisco.com/en/US/docs/switches/lan/catalyst4500/12.1/11/configurati
on/guide/vtp.html#wp1020402
TransparentVTP transparent network devices do not participate in VTP. A VTP
transparent network device does not advertise its VLAN configuration and does
not synchronize its VLAN configuration based on received advertisements.
However, in VTP version 2, transparent network devices do forward VTP
advertisements that they receive on their trunking LAN interfaces.
anyways if
Sw2(config)#vtp mode client
Setting device to VTP CLIENT mode.
Sw2(config)#
3d21h: VTP LOG RUNTIME: Transmit vtp request, domain cisco, start value 0
3d21h: VTP LOG RUNTIME: Transmit vtp request, domain cisco, start value 0
3d21h: VTP LOG RUNTIME: Summary packet received, domain = cisco, rev = 1,
followers = 1, length 77, trunk Fa0/20
3d21h:
3d21h: summary: 01 01 01 05 63 69 73 63 6F 00 00 00 00 00 00 00
....cisco.......
3d21h: summary: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
................
3d21h: summary: 00 00 00 00 00 00 00 01 0A 0A 22 02 39 33 30 3
Sw2(config)#3 ..........".9303
3d21h: summary: 30 32 31 36 30 31 32 34 F4 F8 17 2E CA 4D 80 9B
02160124tx..JM..
3d21h: summary: 1C 17 F9 82 4A 36 7D 89 01 01 01 02 00
..y.J6}......
3d21h:
3d21h: VTP LOG RUNTIME: Summary packet rev 1 greater than domain cisco rev 0
3d21h: VTP LOG RUNTIME: Domain cisco currently not in updating state
3d21h: VTP LOG RUNTIME: pdu len 77, #tlvs 1
3d21h: VTP LOG RUNTIME: Subset packet received, domain = cisco, rev = 1, seq =
1, length = 384
3d21h:
3d21h:
Sw2(config)# subset: 01 02 01 05 63 69 73 63 6F 00 00 00 00 00 00 00
....cisco.......
3d21h: subset: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
................
3d21h: subset: 00 00 00 00 00 00 00 01 14 00 01 07 00 01 05 DC
...............\
3d21h: subset: 00 01 86 A1 64 65 66 61 75 6C 74 00 14 00 01 08
...!default.....
3d21h: subset: 00 0C 05 DC 00 01 86 AC 56 4C 41 4E 30 30 31 32
...\...,VLAN0012
3d21h: subset: 14 00 01 08 00 0D 05 DC 00 01 86 AD 56 4C 41 4E
.......\...-VLAN
3d21h: subset: 30 3
Sw2(config)#0 31 33 14 00 01 08 00 1E 05 DC 00 01 86 BE 0013.......\...>
3d21h: subset: 56 4C 41 4E 5F 42 42 31 14 00 01 08 00 28 05 DC
VLAN_BB1.....(.\
3d21h: subset: 00 01 86 C8 56 4C 41 4E 5F 42 42 32 14 00 01 07
...HVLAN_BB2....
3d21h: subset: 00 37 05 DC 00 01 86 D7 56 4C 41 4E 5F 35 35 00
.7.\...WVLAN_55.
3d21h: subset: 14 00 01 08 00 3C 05 DC 00 01 86 DC 56 4C 41 4E
.....<.\...\VLAN
3d21h: subset: 5F 42 42 33 14 00 01 06 00 64 05 DC 00 01 87 04
_BB3.....d.\....
3d21h: subset: 56 4C 41 4E 5F 42
Sw2(config)# 00 00 14 00 01 06 00 C8 05 DC VLAN_B.......H.\
3d21h: subset: 00 01 87 68 56 4C 41 4E 5F 43 00 00 14 00 01 08
...hVLAN_C......
3d21h: subset: 00 C9 05 DC 00 01 87 69 56 4C 41 4E 30 32 30 31
.I.\...iVLAN0201
3d21h: subset: 20 00 02 0C 03 EA 05 DC 00 01 8A 8A 66 64 64 69
....j.\....fddi
3d21h: subset: 2D 64 65 66 61 75 6C 74 01 01 00 00 04 01 00 00
-default........
3d21h: subset: 28 00 03 12 03 EB 05 DC 00 01 8A 8B 74 6F 6B 65
(....k.\....toke
3d21h: subset: 6E 2D 72 69 6E 67 2D 64 65 66
Sw2(config)#61 75 6C 74 00 00 n-ring-default..
3d21h: subset: 01 01 00 00 04 01 00 00 24 00 04 0F 03 EC 05 DC
........$....l.\
3d21h: subset: 00 01 8A 8C 66 64 64 69 6E 65 74 2D 64 65 66 61
....fddinet-defa
3d21h: subset: 75 6C 74 00 02 01 00 00 03 01 00 01 24 00 05 0D
ult.........$...
3d21h: subset: 03 ED 05 DC 00 01 8A 8D 74 72 6E 65 74 2D 64 65
.m.\....trnet-de
3d21h: subset: 66 61 75 6C 74 00 00 00 02 01 00 00 03 01 00 02
fault...........
3d21h:
3d21h: VTP LOG RUNTIME: Transmit vtp summary, dom
Sw2(config)#ain cisco, rev 1, followers 1, tlv blk size 5 (inc #tlv field),
MD5 digest calculated = F4 F8 17 2E CA 4D 80 9B 1C 17 F9 82 4A 36 7D 89
3d21h: VTP LOG RUNTIME: Transmit vtp summary, domain cisco, rev 1, followers
1, tlv blk size 5 (inc #tlv field),
MD5 digest calculated = F4 F8 17 2E CA 4D 80 9B 1C 17 F9 82 4A 36 7D 89
3d21h: VTP LOG RUNTIME: Transmit vtp request, domain cisco, start value 0
3d21h: VTP LOG RUNTIME: Summary packet received, domain = cisco, rev = 1,
followers = 1, length 77,
Sw2(config)#do show trunk Fa0/19
3d21h:
3d21h: summary: 01 01 01 05 63 69 73 63 6F 00 00 00 00 00 00 00
....cisco.......
3d21h: summary: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
................
3d21h: summary: 00 00 00 00 00 00 00 01 0A 0A 22 02 39 33 30 33
..........".9303
3d21h: summary: 30 32 31 36 30 31 32 34 F4 F8 17 2E CA 4D 80 9B
02160124tx..JM..
3d21h: summary: 1C 17 F9 82 4A 36 7D 89 01 01 01 02 00
..y.J6}......
3d21h:
3d21h: VTP LOG RUNTIME: Summary packet rev 1 equal to do
Sw2(config)#do show main cisco rev 1
3d21h: VTP LOG RUNTIME: Subset packet received, domain = cisco, rev = 1, seq =
1, length = 384
3d21h:
3d21h: subset: 01 02 01 05 63 69 73 63 6F 00 00 00 00 00 00 00
....cisco.......
3d21h: subset: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
................
3d21h: subset: 00 00 00 00 00 00 00 01 14 00 01 07 00 01 05 DC
...............\
3d21h: subset: 00 01 86 A1 64 65 66 61 75 6C 74 00 14 00 01 08
...!default.....
3d21h: subset: 00 0C 05 DC 00 01 86 AC 56 4C 41 4E 3
Sw2(config)#do show 0 30 31 32 ...\...,VLAN0012
3d21h: subset: 14 00 01 08 00 0D 05 DC 00 01 86 AD 56 4C 41 4E
.......\...-VLAN
3d21h: subset: 30 30 31 33 14 00 01 08 00 1E 05 DC 00 01 86 BE
0013.......\...>
3d21h: subset: 56 4C 41 4E 5F 42 42 31 14 00 01 08 00 28 05 DC
VLAN_BB1.....(.\
3d21h: subset: 00 01 86 C8 56 4C 41 4E 5F 42 42 32 14 00 01 07
...HVLAN_BB2....
3d21h: subset: 00 37 05 DC 00 01 86 D7 56 4C 41 4E 5F 35 35 00
.7.\...WVLAN_55.
3d21h: subset: 14 00 01 08 00 3C 05 DC 00 01 86 DC 56 4C 41 4E
Sw2(config)#do show vtp .....<.\...\VLAN
3d21h: subset: 5F 42 42 33 14 00 01 06 00 64 05 DC 00 01 87 04
_BB3.....d.\....
3d21h: subset: 56 4C 41 4E 5F 42 00 00 14 00 01 06 00 C8 05 DC
VLAN_B.......H.\
3d21h: subset: 00 01 87 68 56 4C 41 4E 5F 43 00 00 14 00 01 08
...hVLAN_C......
3d21h: subset: 00 C9 05 DC 00 01 87 69 56 4C 41 4E 30 32 30 31
.I.\...iVLAN0201
3d21h: subset: 20 00 02 0C 03 EA 05 DC 00 01 8A 8A 66 64 64 69
....j.\....fddi
3d21h: subset: 2D 64 65 66 61 75 6C 74 01 01 00 00 04 01 00 00
-default.....
Sw2(config)#do show vtp ...
3d21h: subset: 28 00 03 12 03 EB 05 DC 00 01 8A 8B 74 6F 6B 65
(....k.\....toke
3d21h: subset: 6E 2D 72 69 6E 67 2D 64 65 66 61 75 6C 74 00 00
n-ring-default..
3d21h: subset: 01 01 00 00 04 01 00 00 24 00 04 0F 03 EC 05 DC
........$....l.\
3d21h: subset: 00 01 8A 8C 66 64 64 69 6E 65 74 2D 64 65 66 61
....fddinet-defa
3d21h: subset: 75 6C 74 00 02 01 00 00 03 01 00 01 24 00 05 0D
ult.........$...
3d21h: subset: 03 ED 05 DC 00 01 8A 8D 74 72 6E 65 74 2D 64 65
.m.\....trnet-de
3d21h: s
Sw2(config)#do show vtp status
VTP Version : 2
Configuration Revision : 1
Maximum VLANs supported locally : 1005
Number of existing VLANs : 14
VTP Operating Mode : Client
VTP Domain Name : cisco
VTP Pruning Mode : Enabled
VTP V2 Mode : Disabled
VTP Traps Generation : Disabled
MD5 digest : 0xF4 0xF8 0x17 0x2E 0xCA 0x4D 0x80 0x9B
Configuration last modified by 10.10.34.2 at 3-2-93 16:01:24
Sw2(confubset: 66 61 75 6C 74 00 00 00 02 01 00 00 03 01 00 02
fault......ig)#.....
3d21h:
So in order to work in a network with vtp mode in transparent make no sense to
enable or disable vtp prunning..
it make more sence to enable it on a Server to client relationship
Anyways the Switch in VTP in transparent mode, should be configured with the
necesary vlans.
so for example
Sw2(config-if)#do show vtp status
VTP Version : 2
Configuration Revision : 0
Maximum VLANs supported locally : 1005
Number of existing VLANs : 17
VTP Operating Mode : Transparent
VTP Domain Name : cisco
VTP Pruning Mode : Enabled
VTP V2 Mode : Disabled
VTP Traps Generation : Disabled
MD5 digest : 0xAA 0xD5 0x77 0x45 0xCC 0x3A 0xF6 0x6
Sw2(config-vlan)#do show int trunk
Port Mode Encapsulation Status Native vlan
Fa0/19 on 802.1q trunking 1
Fa0/20 on 802.1q trunking 1
Port Vlans allowed on trunk
Fa0/19 1-4094
Fa0/20 1-4094
Port Vlans allowed and active in management domain
Fa0/19 1,12-13,30,40,55,60,100,200-201
Fa0/20 1,12-13,30,40,55,60,100,200-201
Port Vlans in spanning tree forwarding state and not pruned
Fa0/19 1,12-13,30,40,55,60,100,200-201
Fa0/20 1,12-13,30,40,55,60,100,200-201
Sw2(config-if)#sw mo a
Sw2(config-if)#sw a vlan 666
% Access VLAN does not exist. Creating vlan 666
Sw2(config-if)#do show int trunk
Vlan 666 will pass the trunk link if we do not explicitly tell the trunk to
remove the vlan in the interface configuration
Sw2(config-if)#do show int trunk
Port Mode Encapsulation Status Native vlan
Fa0/19 on 802.1q trunking 1
Fa0/20 on 802.1q trunking 1
Port Vlans allowed on trunk
Fa0/19 1-4094
Fa0/20 1-4094
Port Vlans allowed and active in management domain
Fa0/19 1,12-13,30,40,55,60,100,200-201,405,500,666
Fa0/20 1,12-13,30,40,55,60,100,200-201,405,500,666
Port Vlans in spanning tree forwarding state and not pruned
Fa0/19 1,12-13,30,40,55,60,100,200-201,405,500,666
Fa0/20 1,12-13,30,40,55,60,100,200-201,405,500,666
thanks,
Victor Cappuccio.-
- CCSI# 31452
Network Learning Inc - A Cisco Sponsored Organization (SO) YES! We take
Cisco Learning credits!
victor@ccbootcamp.com
http://www.ccbootcamp.com (Cisco Training and Rental Racks)
http://www.ccbootcamp.com/groupstudy.html (groupstudy member discounts!)
Voice: 702-968-5100
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-----Original Message-----
From: nobody@groupstudy.com on behalf of Michael Zuo
Sent: Fri 6/8/2007 14:45
To: thomas.rader@freesurf.ch; ccielab@groupstudy.com
Subject: RE: STP lab gotchas
This is one of the biggest gotcha's I've run into: Be aware of the
combination of VTP transparent mode and VTP pruning, which can prune
vlans on switches where you don't want them pruned ;)
Michael Zuo
CCIE #17800
CCIE study notes for sale :)
http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&ih=003&sspagename=STRK%3AM
ESE%3AIT&viewitem=&item=130121212718&rd=1&rd=1
-----Original Message-----
From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On Behalf Of
thomas.rader@freesurf.ch
Sent: Friday, June 08, 2007 2:17 AM
To: ccielab@groupstudy.com
Subject: STP lab gotchas
Hello,
I'm hearing more and more that with the 4 switch labs, candidates are
having issues with STP loops.
Does anyone know of any STP gotchas that could give you issues in the
lab ?
Thanks, Thomas
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