Connecting C3750X-24P stack to Nexus5k

[dorsia]

                   I have 6unit C3750X-24P in stack configuration and I have been instructed to connect to Nexus 5K using SFP-10G-SR and via trunk port connection. Is this connection supported ? Can you provide a document linking to this type of connection or information that will tell this is supported.

Thanks,

Danny

[richbarb]

Hello Dorsia,

Is it a pair of nexus 5K? If yes, the recomendation is to connect using vPC.

Anyway, this connection will be supported, is a simple connection.

This old thread can help you throught the configuration.

https://supportforums.cisco.com/thread/2112331

[dorsia]

Hello Richard,

It is a pair of Nexus5k as Nexus5k-DC1 and Nexus5k-DC2.

I have single trunk port connection each of Nexus5k to c3750xStack.

My configuration is this:

4) On Nexus5K-DC1:
Allowed vlan 211-215 between Nexus5K-DC1 & Nexus5K-DC2 connectivity. This is
represented on port channel1

conf t
int po1
switchport trunk allowed vlan add 211-215
exit

#Connectivity of Nexus5k-DC1 via interface ethernet2/7 as
a trunk port to Cerner-SW1(c3750x) int TenG1/1/2

Create trunk Nexus5K-DC1_eth2/7 and allowed vlan 201, 211-215.
This interface connects to Cerner-SW1(c3750x) TenG1/1/2

For Nexus5k-DC1:
int eth2/7
switchport trunk encapsulation dot1q
switchport mode trunk
switchport trunk allowed vlan add 201, 211-215
exit

5)On Nexus5K-DC2:
Allowed vlan 211-215 between NexusDC1 & NexusDC2 connectivity. This is represented
by int port-channel1

conf t
int po1
switchport trunk allowed vlan add 211-215
exit

#Connectivity of Nexus5k-DC2 via interface ethernet2/7 as
a trunk port to Cerner-Switch1(c3750x) int TenG6/1/2

Create trunk eth2/7 and allowed vlan 201, 211-215
This interface connects to Cerner-SW1(c3750x) TenG6/1/2

For Nexus5k-DC2:
int e2/7
switchport trunk encapsulation dot1q
switchport mode trunk
switchport trunk allowed vlan add 201, 211-215
exit

6) On Cerner SW1(c3750x):
Configure int TenG1/1/2 to trunk port
Configure int TenG6/1/2 to trunk port

conf t
int TenG1/1/2
switchport trunk encapsulation dot1q
switchport mode trunk
switchport trunk allowed vlan 201, 211-215
exit

int TenG6/1/2
switchport trunk encapsulation dot1q
switchport mode trunk
switchport trunk allowed vlan 201, 211-215
exit

Will it be sufficient enough to be a trunk port connection only to each Nexus5k? or should I make configuration port channel on c3750x and port channel also to Nexus5k? So vPC is defined on interface portchannel not on physical interface?

[richbarb]

Hello Dorsia,

I highly recommend to use vPC. In this configuration you are not using vpc and the spanning-tree will mess up you network design.

vPC is defined in the port-channel configuration, but before that you must create a vpc domain with a peer-link and a keep-alive link.

Richard