STP Convergence loosing packets
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Forum Name: CCIE
Forum Discription: Discuss the CCIE written and lab here.
URL: http://certcities.com/forums/forum_posts.asp?tid=5351
Printed Date: 14 October 2007 at 12:08pm
Topic: STP Convergence loosing packets
Posted by: Salmoh
Subject: STP Convergence loosing packets
Date Posted: 27 August 2007 at 11:45am
Example here:
Two 6509 cores each configured as a root STP MST for two MST instances. Both cores are in the same VTP domain.
If I add/remove a new VLAN to either MST instance, will it drop packets during convergence? |
Replies:
Posted by: stone
Date Posted: 10 September 2007 at 7:02pm
Posted by: Headhunter
Date Posted: 10 September 2007 at 9:58pm
Nope, because STP is not a routing protocol so it doesn't converge and we are talking about frames here not packets
if however a trunk or root goes down then you might have dropped frames
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Koen
CCSI#30501 CCNP CCIP CCVP CCSP CCDP CQS-Cisco Wireless LAN Design & Support Cisco Unity Design Specialist Cisco IP Telephony Design Specialist JNCIA-ER MCSE MCSA:Messaging |
Posted by: Salmoh
Date Posted: 11 September 2007 at 6:20am
This is what happens when I test this:
6509_01 has MST Instance1 and is the VTP Domain server.
6509_02 has MST Instance2 and is a client in the VTP Domain.
When I add/remove a VLAN to the server, it takes about 5-6 minutes to converge the network (apx. 300 switches). I have clients/servers that must be rebooted when they loose packets, thus, requiring me to schedule VLAN management when operations is down.
The MST does not impact the network so long as you keep all of your switches appropriately assigned with the MST configuration (eg, domain, client/trans., VLAN/instance assignments). If a single switch is added to the MST instance(s) and is not properly configured with the correct VTP info, it creates havoc with converging MST and VTP. It's like adding a new MST instance and VTP domain to the LAN.
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