From: Peter Stephan (pgstephan@gmail.com)
Date: Thu Aug 14 2008 - 17:19:04 ART
Hello guys,
Know most of you had heard about this scenario. But I was actually
labbing-it up to see it after I heard about it.
Topolgy:
SW1 ===== SW2 (vlan41)
vlan41 ||
||
SW3
SW1 is VTP server, SW3 is VTP client, and SW2 is VTP transparent.
vlan 41 exists in SW1 and SW2 but not on SW3. So it got prunned from SW1's
trunk as no join message was sent from SW3 for vlan 41
Now the problem that I can see it pruned on the trunk from sw1 to sw2, but
still I'm able to ping from SW1 to SW2!
spanning-tree is active on this vlan...
Here you go:
SW1:
Port Mode Encapsulation Status Native vlan
Fa0/14 on 802.1q trunking 1
Port Vlans allowed on trunk
Fa0/14 1-4094
Port Vlans allowed and active in management domain
Fa0/14 1,3,7,9,13,26,41,43,62
Port Vlans in spanning tree forwarding state and not pruned
Fa0/14 1,3,9,26,43
SW2
Port Mode Encapsulation Status Native vlan
Fa0/14 on 802.1q trunking 1
Port Vlans allowed on trunk
Fa0/14 1-4094
Port Vlans allowed and active in management domain
Fa0/14 1,13,26,41,62
Port Vlans in spanning tree forwarding state and not pruned
Fa0/14 1,13,26,41,62
And when I take it off from the trunk:
SW1(config-if)#do pi 164.29.47.4
Type escape sequence to abort.
Sending 5, 100-byte ICMP Echos to 164.29.47.4, timeout is 2 seconds:
!!!!!
Success rate is 100 percent (5/5), round-trip min/avg/max = 1/1/1 ms
SW1(config-if)#int fa0/14
SW1(config-if)#swi tru allo v rem 41
SW1(config-if)#
01:27:25: %LINEPROTO-5-UPDOWN: Line protocol on Interface Vlan41, changed
state to down
SW1(config-if)#do pi 164.29.47.4
Type escape sequence to abort.
Sending 5, 100-byte ICMP Echos to 164.29.47.4, timeout is 2 seconds:
....
Success rate is 0 percent (0/4)
SW1(config-if)#
Thx,
Peter.
Blogs and organic groups at http://www.ccie.net
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