topic Re: Cisco 3020 in Switches, Hubs, and Modems

Cisco 3020

DAC_1 — Mon, 07 Jun 2010 11:04:59 GMT

Hi All,

im wondering if someone can help me with understanding the physical to logical connectivity of the cisco 3020 in a C-Class.

i've read the following documents but i just cant my head around how the actual physical cabling works.

http://www.cisco.com/en/US/prod/collateral/switches/ps6746/ps6748/ps6765/design_guide_c07-468192.pdf

I understand that the 3020 is in fact a 24 port switch, 16 internal and 8 external. we have 4 3020 and im struggling to understanding how one of our blades is seeing that it has 6 nics.

thanks

Re: Cisco 3020

Jack Howes — Mon, 07 Jun 2010 11:13:13 GMT

Hi Will,
Maybe your blade has 6 nics. Four on a mezzanine card and the two embedded. Does the output show all six Nics conected/linked?

Re: Cisco 3020

Jack Howes — Mon, 07 Jun 2010 11:26:57 GMT

I just looked at you attachment and indeed your blade hax six nics. The two ports on the NC364M that don't say "ok" are wired to slots 5 & 6 that don't have a network card installed.

/jack

Re: Cisco 3020

DAC_1 — Mon, 07 Jun 2010 15:07:07 GMT

Hi Jack,

thanks for the reply.

So each blade has 2 nic cards physically in it, 1 card containing 2 on board nics and 1 card containing 4 nics - correct?

so for argument sake i want to connect say both the on board nics to physical port 17 and 18 on the cisco how do i go about that? is this possible with the 16 internal ports on this switch?

thanks again

Re: Cisco 3020

Jack Howes — Mon, 07 Jun 2010 15:50:19 GMT

The server NICs can only connect to ports 1-16 on each switch. If I remember and could be wrong about this particular switch, ports 17 & 18 are connections between hozizontal switches. In cisco speak you can create an etherchannel between horizontal network switches.

/jack

Re: Cisco 3020

Pieter 't Hart — Tue, 08 Jun 2010 09:20:23 GMT

you cannot map the nic to a switchport!

there is a predefined mapping between blade/card/port to slot/port

you mustn't look at the switch docs but the chassis's doc's

look at attachment for c7000 chassis and half height blades

Re: Cisco 3020

DAC_1 — Tue, 08 Jun 2010 13:54:37 GMT

Hi Peter,

Thanks for the info, so how would i present 2x nics to storage, 2 nics to production network and 1 x nic to another vlan? Since i have 14 blades and would like the above configuration is this possible with the 3020?

many thanks

Will

Re: Cisco 3020

Pieter 't Hart — Tue, 08 Jun 2010 14:11:31 GMT

Hi Will,

>>> im struggling to understanding how one of our blades is seeing that it has 6 nics.<<<
this blade probably has a 4-port NIC mezzanine card in mezzanine-port2 of the blade.

did you look at my attachment?
this is only page-45, page-46 tells you more about the 4-port card in mezzanine slot-2.

embedded nic1 and nic2 of blade-N are mapped to bay1 port-N and port-N+8
there is a similar calculation for the other ports.

You probably don't have switch-modules in bay's 5 and 6 of your enclosure?

Re: Cisco 3020

DAC_1 — Tue, 08 Jun 2010 14:35:10 GMT

Hi Peter,

yes I did look at your image so thank you but I apologise as even looking at image you sent I still cannot get my head round the calculations of the ports.

please can you post the chassis docs here as look at all the docs I can find and looking at p45-p46 I cannot see any more information about this connections.

yes you are correct we don't have anything in interconnect bays 5-6. thanks for this and sorry i cant get my head round this....

thanks

Re: Cisco 3020

Pieter 't Hart — Wed, 09 Jun 2010 07:37:32 GMT

let's both look at the same doc
HP BladeSystem c7000 Enclosure Setup and Installation Guide
http://h20000.www2.hp.com/bc/docs/support/SupportManual/c00698286/c00698286.pdf

My screenshot is not from this doc!
but was meant to point you out how it works.

in the above mentioned doc, page 49 says :
NIC 1 maps to bay1/Port N and
NIC 2 maps to bay2/Port N
in bay1 and -2 you must place the two 3020 ethernet switches.

So in full:
blade1
Embedded NICs
nic1 connects to port1 of bay1/lansw
nic2 connects to port1 of bay2/lansw
Mezzanine slot1 (2port iSCSI)
m1iSCSI1 connects to port1 of bay3/iSCSIsw
m1iSCSI2 connects to port1 of bay4/iSCSIsw
Mezzanine slot2 (4port NIC)
m2nic1 connects to port1 of bay5
m2nic2 connects to port1 of bay6
m2nic3 connects to port1 of bay7/lansw
m2nic4 connects to port1 of bay8/lansw

bay 5 and 6 have no lansw installed.
this matches your screenshot

blade10
Embedded NICs
nic1 connects to port10 of bay1/lansw
nic2 connects to port10 of bay2/lansw
Mezzanine slot1 (2port iSCSI)
m1iSCSI1 connects to port1 of bay3/iSCSIsw
m1iSCSI2 connects to port1 of bay4/iSCSIsw
Mezzanine slot2 (4port NIC 1x or 2x card)
m2nic1 connects to port10 of bay5
m2nic2 connects to port10 of bay6
m2nic3 connects to port10 of bay7/lansw
m2nic4 connects to port10 of bay8/lansw

Re: Cisco 3020

DAC_1 — Thu, 10 Jun 2010 10:10:09 GMT

Ah, i have it.

thank you very much for taking the time to explain it.

may thanks

Re: Cisco 3020

Pieter 't Hart — Thu, 10 Jun 2010 11:55:49 GMT

thanks for feedback and thanks for the points.
Pieter