From: Peter Stephan (engpeter@gmail.com)
Date: Sat Jul 26 2008 - 09:23:23 ART
Dear GS,
While trying to order these technologies and correlate them, I found myself
unable to understand some stuff which I'm sure we have to be sure of while
taking the IE.
I arranged this simple topology:
SW1: VTP Domain CCIE, server, VTP prunning enabled.
SW2: VTP Domain CCIE, client, VTP prunning inherited from server.
In SW1, one interface is member of vlan 20, while in SW2 there's no vlan 20
members.
Interface fa0/13 dot1q between both switches with all vlans allowed
initially.
Seeing vlan 20 pruned from the trunk, I can still see the PVST vlan 20
running in-between.
(I expected to see the trunk not allowing even the BPDUs for STP vlan 20,
which is not the case here, and the SVI yet UP and functional).
But when I banned vlan 20 from the trunk, the STP got disabled and the SVI
went down.
Now please help me ensuring below concepts are correct:
1) SVI status is based on the spann vlan status.
2) Why prunning do not filter PVST BPDUs, when filtering a VLAN through a
trunk.
3) When prunning, the pruned vlan appeared pruned from the upstream switch,
but not on the switch who requested the prunning.
Thanks guys and sorry for the long mail.
Peter.
This archive was generated by hypermail 2.1.4 : Mon Aug 04 2008 - 06:11:57 ART