From: Rajib Khan (rajib56666@yahoo.com)
Date: Mon Nov 28 2005 - 06:13:00 GMT-3
That is an excellent solution Ralph
Ralph <Mandela@myrealbox.com> wrote:
Yes Chris, It is not a per Vlan setting. But it does change the default behavior of the switch - making the port with the lower port # the root port, in a back2back connection. Using this in combination with making SW1 the root for VLANS 22,23; and SW2 the root for 32,33 works perfectly as desired.
If you have the the time, try labbing it up.
Ralph.
-----Original Message-----
From: Chris Lewis
To: Ralph , rajib56666@yahoo.com
Date: Sun, 27 Nov 2005 14:20:14 -0800 (PST)
Subject: Re: switch configuration
Hi Ralph,
Please check this with reference to the show spanning tree vlan X command on the non-root switch, where X is the vlan you want to investigate. You are correct that setting the bandwidth on an interface affects cost and hence which port on the non-root bridge is used for forwarding, but that is set for all vlans, it is not a per vlan setting to my knowledge.
Chris
Ralph wrote:
SW1--------------------SW2
ports 13 and 14 are trunking on both switches.
The basic idea is to modify the bandwidth of port 13 of SW2. Since path cost is derived from the bandwidth. This will make port 14 on SW2 the root port for VLANs 22,23. Here is a sample:
SW1 is made the root for VLANS 22, 23
SW2 is made the root for VLANS 32, 33
SW1#sh interfaces trunk
Fa0/13 1,22-23,32-33
Fa0/14 1,22-23
SW1#
SW2#sh interfaces trunk
Fa0/13 1,22-23,32-33
Fa0/14 32-33
SW2#
There is no load-balancing yet. All Vlans use Port 13 on both switches.
To load -balance: Instead of using port cost on SW2 port 13, you can modify the bandwidth from the default of 100000 to 10000. Since path cost is derived from bandwidth.
hostname SW2
interface FastEthernet0/13
switchport trunk encapsulation dot1q
switchport mode trunk
bandwidth 10000
!
SW1#sh interfaces trunk
Fa0/13 1,22-23,32-33
Fa0/14 1,22-23
SW1#
SW2#sh interfaces trunk
Fa0/13 32-33
Fa0/14 1,22-23,32-33
SW2#
Now Load-balancing and failover is accomplished using spanning tree.
HTH
Ralph.
-----Original Message-----
From: Rajib Khan
To: "ccielab@groupstudy.com"
Date: Thu, 24 Nov 2005 07:32:44 -0800 (PST)
Subject: switch configuration
Hi Group
Could any one please help me with the followings
SW1 ------------ SW2
There are 2 trunk port between sw1 and sw2, I want to send vlan 22,23 via one link and 32,33 other link but if one link fails then other link should forward all vlans. Is there any way can you achieve this with out using port priority and port cost
Thanks in advance
Raj
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