Port's states

[igor_bakman]

Hi all,

I would like to know the meaning and consequences of the next port's states:

• SFP not present
• Link failure: loss of signal
• Link failure or not-connected
• Externally Disabled

Best regards,

Igor.

[dynamoxxx · Accepted solution]

http://www.cisco.com/en/US/products/ps5989/prod_troubleshooting_guide_chapter09186a008067a2bb.html

@dynamoxxx

[igor_bakman]

Once again, you've been a great help.

[dynamoxxx]

sure thing

@dynamoxxx

[igor_bakman]

BTW,

What is the severity if port's state is "SFP not present" ?

Regards,

Igor.

[dynamoxxx · Accepted solution]

i don't know but it just means there is no optic in the switch port

@dynamoxxx

[igor_bakman]

ok, thanks.

[igor_bakman]

I have another question.

I'm trying to astablish the severity of the next properties (bolded) in every port:

#show interface:

fc1/22 is trunking

      125022784820 frames input, 207914112515668 bytes

        0 discards, 0 errors

        0 CRC,  0 unknown class

        0 too long, 0 too short

      231548791576 frames output, 404654647370664 bytes

        1230 discards, 0 errors

mgmt0 is up

      0 underruns, 12993 output errors

      12993 carrier errors

I'm wondering, what are the threshlods for those properties (discards, errors, output errors,CRC, too long, too short, carrier errors)to claim that the port is faulted?

Best regards,

Igor.

[dynamoxxx]

good question, but i have no idea. Maybe other folks can chime in.

@dynamoxxx

[igor_bakman]

Anyone?

[igor_bakman]

I'm on a roll,

I have a question regarding prot's rate-mode:

Is there any limitations, recommendations or best practices regarding defining rateMode=dedicated on a module or on the hole switch?

Regards,

Igor.

[dynamoxxx]

you have to use dedicated for ports that will be used as members of port-channel. I also like to set "dedicated" on ports that i am connecting from my storage arrays. I do have some big AIX servers that i set dedicated as well but everything else is shared

@dynamoxxx

[igor_bakman]

Thanks.

So to make it clear, dedicated is mandatory for ports in port-channels, otherwise it's optional?

There aren't issues of "overusing" dedicated?

Best regards,

Igor.

[dynamoxxx]

Igor,

dedicated is mandatory for port-channels, otherwise it's at your descretion.

Santkumd528,

when i connect storage array ports to cards on my MDS directors (9513), first i try to spread them between the different port groups, for example:

Port-Group 1

  Total bandwidth is 12.8 Gbps

  Total shared bandwidth is 12.8 Gbps

  Allocated dedicated bandwidth is 0.0 Gbps

  --------------------------------------------------------------------

  Interfaces in the Port-Group       B2B Credit  Bandwidth  Rate Mode

                                        Buffers     (Gbps)           

  --------------------------------------------------------------------

  fc1/1                                      32        8.0  shared   

  fc1/2                                      32        8.0  shared   

  fc1/3                                      32        8.0  shared   

as you can see there are 3 ports in this port-group, they all share 12.8 Gbps of bandwidth. If i connected storage array controller port to port fc1/1 and this is a 8G capable port, i could set it's rate to dedicated to make sure it always has access to 8G worth of bandwidth. The remaining 4.8G will be shared between ports fc1/2 and fc1/3 ..so you could connect some low i/o systems to those.

@dynamoxxx

[santkumd528]

Dynamox,

also what is special about the connection from storage array? What is your logic behind that?