Internal LAN adapter configuration commands

Unanswered Question
Jan 28th, 2005

Could anyone describe me the meaning of hsma

command option:

7206MEDA(cfg-lan-Token 0)#adapter 1 4000.0047.4522

7206MEDA(cfg-adap-Token 0-1)#?

Internal Lan Adapter configuration commands:

hsma Hot Standby MAC Address parameters

Thanks in advance for any information

I have this problem too.
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jmollman Fri, 01/28/2005 - 11:31

It is a new option to allow 2 CMCC lan adapters with the same MAC addresses bridged to the same

ethernet segment. An LLC session is established

between a pair of control adapters, one on each

CMCC. The LLC session only allows one of the 2

adapters with the same MAC address to be active

at the same time. If one adapter fails, the other

is activated.

mbinzer Fri, 01/28/2005 - 13:37

Hi,

I have attached a document describing what hsma is all about in more detail, including sample configurations.

In very simple words. It is a mechanism, a little bit like hsrp, to allow to cip's to backup each other. You configure a virtual adapter which is always only active on one of the two cip's and they monitor each other. If one cip goes down, the other one takes over and activates the virtual adapter.

When the two cip routers were connected to a tokenring infrastructure than the redundancy whas achived by using the same mac address on the cip's reachable over to different source bridged path using different rif's.

If you connect the two cip routers via a ethernet than there is no rif field in your packets anymore, you can not do source bridging. Additional the cam table of a ethernet switch can not deal with two times the same mac address on different ports in the same vlan.

Hsma allows for a similar level of redundancy if your cip routers are connected via a ethernet backbone.

thanks...

Matthias

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Posted January 28, 2005 at 8:16 AM
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