From: Palacios, Gonzalo (gpalacios@xxxxxxxxxxxxxxxxx)
Date: Fri Nov 02 2001 - 18:27:22 GMT-3
uplinkfast is a very cool feature, check it out.
-----Original Message-----
From: Patel Kamlesh [mailto:KaPatel@tycomltd.com]
Sent: Friday, November 02, 2001 3:59 PM
To: 'ccielab@groupstudy.com'
Subject: spanning-tree across four switches
I have Lab setup with four switches without stack mode.
SW1 --------------------Sw2
| |
| |
| |
Sw3-------------------- Sw4
Theses all switches (2924XL) are connected via Gbic Ethernet trunk (ISL)
port, each switch has same 6 VLANs (VLAN: 100, 110, 120.....) configured,
Switch 1 is a root for all spanning tree running in VLANs. What is the
best way to minimize spanning tree recalculation in event of failure of one
of the link. and also to avoid looping.
Switch :1 configured with :
spanning-tree vlan1 priority 0
spanning-tree vlan 100 priority 0
.........
........
Switch 2:
spanning-tree vlan1 priority 10
spanning-tree vlan 100 priority 10
..............
.............
Switch 3:
spanning-tree vlan1 priority 100
spanning-tree vlan 100 priority 100
.........
.........
Switch 4
spanning-tree vlan1 priority 100
spanning-tree vlan 100 priority 100
..............
............
When I tested for failure with one of the link, It takes time to
recalculate spanning tree. I tried to configure forward-delay 8 and max-age
10 , but still wanted to know way to minimize down time less than 1-2
sec.
Thanks in advance
Kamlesh
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