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Community Member

Unicast flooding

How do you distinguish between normal unicast traffic and actual unicast "flooding". Is there some level that constitutes flooding. Here's the partial output from one of my core routers...

rs-risf3-2#sho int vlan1 | inc ucast

L2 Switched: ucast: 6843846782 pkt, 3182375607560 bytes - mcast: 5532025 pkt, 401281030 bytes

L3 in Switched: ucast: 203261264 pkt, 141723254505 bytes - mcast: 0 pkt, 0 bytes mcast

L3 out Switched: ucast: 711654681 pkt, 111280547628 bytes mcast: 0 pkt, 0 bytes

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Hall of Fame Super Bronze

Re: Unicast flooding

Glad to be of help

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4 REPLIES
Hall of Fame Super Bronze

Re: Unicast flooding

Please refer to the following documentation:

http://www.cisco.com/en/US/products/hw/switches/ps700/products_tech_note09186a00801d0808.shtml

It explains the unicast behavior and troubleshooting tips.

HTH,

__

Edison.

Community Member

Re: Unicast flooding

Edison, I'm looking at that very document where it says the following:

"Limited flooding is part of the normal switching process. There are situations, however, when continuous flooding can cause adverse performance effects on the network..."

So if limited flooding is normal it leads me back to my original question...how do you know when you've reached the point of continuous flooding where it should be investigated and changed? When you start having issues with bandwidth?

/rls

Community Member

Re: Unicast flooding

Edison, I've read the article a little more in-depth now and it does go into the details I'm asking about. Thanks for the info and for pointing that out.

/rls

Hall of Fame Super Bronze

Re: Unicast flooding

Glad to be of help

Please remember to rate helpful posts

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