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New Member

Internal LAN - No port channels (chassis discovery policy)

I noticed I have a one link linking group preference of none set on my chassis/fex disovery policy

 

then I noticed that under the LAN tab, under internal LAN, there is no port channel set.

 

When I change the policy to 1 link and port channel and reack the chassis, I see 4 ports under the port channel in internal LAN.

 

Is it necessary to change the policy to port channel or can i just leave it at none? 

 

What would be the difference?

  • Unified Computing
1 ACCEPTED SOLUTION

Accepted Solutions
VIP Red

Best practise is to use port

Best practise is to use port-channel between IOM and FI; (this requires second generation hardware for FI (62xx) and IOM (220x)

If your discovery policy is set to 1, and you ack the chassis, it will automatically create a pc of 4 links.

5 REPLIES
VIP Red

Best practise is to use port

Best practise is to use port-channel between IOM and FI; (this requires second generation hardware for FI (62xx) and IOM (220x)

If your discovery policy is set to 1, and you ack the chassis, it will automatically create a pc of 4 links.

New Member

IF i change the policy to

IF i change the policy to port channel and reack the chassis, will that affect the hosts?

VIP Red

Reack the chassis disrupts

Reack the chassis disrupts any traffic from the IOM to FI for about 20-25 seconds. No server will be rebooted; most OS can tolerate this outage of traffic; however, if you run e.g. a heavy loaded database server, it might not like it.

New Member

Does it support only even

Does it support only even number of links from the iom to the FI?

 

Does it support 3 links per iom?

VIP Red

NO -> Link Discovery Policy

NO -> Link Discovery Policy can be only 1, 2, 4, 8, depending of the IOM model

see Table 7: Chassis/FEX Discovery Policy and Chassis Links

http://www.cisco.com/c/en/us/td/docs/unified_computing/ucs/sw/gui/config/guide/2-2/b_UCSM_GUI_Configuration_Guide_2_2.pdf

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