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Cisco Catalyst Blade Switch 3020 for HP - vlan question

Cheshire42
Advisor

Cisco Catalyst Blade Switch 3020 for HP - vlan question

I have a C9000 enclosure with Cisco 3020s on the back plane.

I'm partially knowledgable of configuring these, but am stuck at the moment.

I need one of the external ports (g0/17-g0/24) to be assigned a vlan so that I can trunk it to the internal ports I have my blades running as an ESX cluster (g0/9-11, g0/15-16).

Though I don't know how to configur this internally on the switch.

Thank you immensely for any help!


-Aaron
4 REPLIES
Pieter 't Hart
Honored Contributor

Re: Cisco Catalyst Blade Switch 3020 for HP - vlan question

>>> so that I can trunk it to the internal ports <<<

???
do you mean vlan-trunk (cisco terms) or port-channel-trunk (procurve terms)?

here is how to configure a port-channel:
interface GigabitEthernet0/19
description <<** Connected to Aggregation-1 **>>
channel-group 1 mode on
interface GigabitEthernet0/20
description <<** Connected to Aggregation-1 **>>
channel-group 1 mode on

here is how to configure the a vlan-trunk:
interface GigabitEthernet0/20
switchport trunk encapsulation dot1q
switchport trunk allowed vlan
or:
Interface port-channel1
switchport trunk encapsulation dot1q
switchport trunk allowed vlan


Is it connected to a cisco external switch or procurve?
Is your switch virtual connect capable?

check if if you can find missing info in this doc:
http://www.cisco.com/en/US/prod/collateral/switches/ps6746/ps6748/ps6765/design_guide_c07-468192.pdf
Cheshire42
Advisor

Re: Cisco Catalyst Blade Switch 3020 for HP - vlan question

I have the internal interfaces (g0/9-11, g0/15-16) configured for dot1q trunking.

The external port (g0/17-24) has a connection to another cisco switch (catalyst 3560).

Is it possible to encapsulate the connection from the external port into some sort of internal vlan so that the internal interface will use vlan tagging when using this connection to communicate with the blade?
Pieter 't Hart
Honored Contributor

Re: Cisco Catalyst Blade Switch 3020 for HP - vlan question

>>>
Is it possible to encapsulate the connection from the external port into some sort of internal vlan so that the internal interface will use vlan tagging when using this connection to communicate with the blade?
<<<

Normally you would want to configure the external ports (or port-channel) for dot1q trunking like you did for the internal ports.
Offcourse this must also be done on the external switch (3560).
- packets from the 3560 are sent tagged to the 3020
- the 3020 inspect the packet using the tag
and determines what port it must be send out (using mac-adress table)
- on an internal port it will send the packet tagged with the original vlan-id.

If you just want to connect the external port for a single vlan, you must configure it as an access-port with native vlan-id the id of the vlan of the destination.
Packets revceived without vlan tag will have native-vlan-id-tag added before they are sent out on a dot1q port (one of the internal ports).
And the tag will be removed for reverse traffic to the external switch.
Cheshire42
Advisor

Re: Cisco Catalyst Blade Switch 3020 for HP - vlan question

Thank you very much,
Access port configuration was what I was after / needed.