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TOPIC: spanning-tree

spanning-tree 4 years 8 months ago #37737

  • bkash
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plz find out what is the diffrent between flowing 2 spanning-tree details..
BOOTLDR: C2960 Boot Loader (C2960-HBOOT-M) Version 12.2(25r)SEE1, RELEASE SOFTWARE (fc1)
1.
Fa0/21 Desg FWD 19 128.21 P2p
Fa0/22 Desg FWD 19 128.22 P2p
Fa0/23 Desg FWD 19 128.23 P2p
Fa0/24 Desg FWD 19 128.24 P2p
Gi0/1 Desg FWD 19 128.25 P2p
Gi0/2 Desg FWD 19 128.26 P2p

2.
Fa0/21 Desg FWD 19 128.21 P2p
Fa0/22 Desg FWD 19 128.22 P2p
Fa0/23 Desg FWD 19 128.23 P2p
Fa0/24 Desg FWD 19 128.24 P2p
Gi0/1 Altn BLK 19 128.25 P2p
Gi0/2 Root FWD 19 128.26 P2p

how do i change in 1 st one as like 2 (Altn BLK 19 & Root FWD 19)
plz suggest me..
some configuration are:-
spanning-tree mode pvst
spanning-tree extend system-id
i m using default vlan 1.
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Re: spanning-tree 4 years 8 months ago #37751

  • TheBishop
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Are these two outputs taken from the same physical switch? If they are then the diffeences you're seeing here are just an indication that spanning-tree has elected a different root switch on both occasions
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Re: spanning-tree 4 years 8 months ago #37754

  • bkash
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this is diffrent switch out pit:
sw1#Gi0/1 Desg FWD 19 128.25 P2p
Gi0/2 Desg FWD 19 128.26 P2p

sw2#Gi0/1 Altn BLK 19 128.25 P2p
Gi0/2 Root FWD 19 128.26 P2p

i want to know same as sw2 in sw1.....this is two different link
Gi0/1----fiber connection
Gi0/2---- UTP vat 6 cable connetion.
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Re: spanning-tree 4 years 7 months ago #37773

  • TheBishop
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Sorry about the delay in replying.
So as I understand it you have two switches sw1 and sw2, and there is a fibre connection between them via Gi0/1 and a copper connection between them via Gi0/2.
If thta;s the case then the output you've provided indicates that spanning tree is working correctly. Sw1 is the root switch because all its ports are forwarding. On Sw2, Gi0/2 is the root port (the one spanning tree has selected as the best path to the root switch) so that one is forwarding. And Gi0/1 on sw2 is blocking which is spanning tree's way of preventing a network loop.
Have a look at
url=http://www.google.co.uk/url?sa=t&rct=j&q=spanning%20tree%20basics&source=web&cd=1&ved=0CCUQFjAA&url=http%3A%2F%2Fwww.cisco.com%2Fwarp%2Fpublic%2F473%2Fspanning_tree1.swf&ei=gOErT5bsC4-MswbUgt2WDQ&usg=AFQjCNEzMDPn5x5dZh5l9eSHe7zLwsd1tg]This tutorial[/url]
to see if this makes it any clearer for you
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