Cisco Support Community
cancel
Showing results for 
Search instead for 
Did you mean: 
Announcements

Welcome to Cisco Support Community. We would love to have your feedback.

For an introduction to the new site, click here. And see here for current known issues.

New Member

Root Guard ?

Hi,

Using PVST+ I have two 3550's linked via a Gig uplink (cost 4 to root) and a fas eth uplink (cost 19 to root).

Switch A is my root bridge by lowest priority. If I guard the RP i.e. Gig 0/1 on my root bridge and leave the fast ethernet port unguarded and then change my priority on switch B to be lower I find that Switch B becomes the root bridge. Can I conclude that I must configure 'root guard' on all forwarding ports on my root bridge to protect the integrity of the root bridge ?

Regards,

Phil.

1 REPLY
Bronze

Re: Root Guard ?

You must enable root guard on all ports where the root bridge should not appear. This would include the root bridge and other switches in the network.

http://www.cisco.com/en/US/tech/tk389/tk621/technologies_tech_note09186a00800ae96b.shtml

109
Views
5
Helpful
1
Replies