Nexus 5548 - 3750x Trunk

darcy · ‎10-26-2011

I have 2 - Nexus 5548's connecting to a 3750x stack. I'm trying to bring up a trunk between the a Nexus 5548 and the master switch. The trunk will not come up. Is the native Vlan a requirement? Below is what I currently have configured. I have tested on the 5548 and the Vlan's are up and running.

Nexus 5K

Int vlan 300

Description Management

Ip address 10.31.0.2/24

Hsrp 0

Preempt

Priority 200

Ip 10.31.0.1

No shutdown

!

Int vlan 302

Description MDF_148_R1_Data

Ip address 10.31.2.2/23

Hsrp 2

Preempt

Priority 200

Ip 10.31.2.1

Ip dhcp relay address 10.1.1.25

No shutdown

!

Int vlan 304

Description MDF_148_R1_Voice

Ip address 10.31.4.2/23

Hsrp 4

Preempt

Priority 110

Ip 10.31.4.1

Ip dhcp relay address 10.1.1.25

No shutdown

Interface port-channel 12

Switchport mode trunk

Interface e1/1

Switchport mode trunk

Channel-group 12 mode active

3750x

Interface Te1/1/1

Switchport mode trunk encapsulation dot1q

Switchport mode trunk allowed vlan 1,300,302,304

Switchport mode trunk

When I do a "show int trunk" on the 5548 it show's the po12 with a native vlan 1 and status of trunk-down

Po12 - vlans allowed 1,300,302,304

This is a new install. I appreciate all the help.

joonyounglee · ‎10-31-2011

Hi.

VSS --- (Trunk) ---- NEXUS 5K

### config ###

- VSS

interface TenGigabitEthernet1/3/2

description ## To Private-N5K-1(T1/18) ##

switchport

switchport trunk encapsulation dot1q

switchport trunk native vlan 31

switchport trunk allowed vlan 11,31,310,404,603,701,776

switchport mode trunk

channel-group 300 mode on

interface Port-channel300

description ## To Private-N5K ##

switchport

switchport trunk encapsulation dot1q

switchport trunk native vlan 31

switchport trunk allowed vlan 11,31,310,404,603,701,776

switchport mode trunk

- NEXUS 5K

interface Ethernet1/18

description ## To VSS ##

switchport mode trunk

switchport trunk native vlan 31

switchport trunk allowed vlan 11,31,310,404,603,701,776

channel-group 300

interface port-channel300

description ## To Private-VSS ##

switchport mode trunk

vpc 300

switchport trunk native vlan 31

switchport trunk allowed vlan 11,31,310,404,603,701,776

speed 10000

JooN Young LEE

Edison Ortiz · ‎11-01-2011

Are you doing vPC from the 2 Nexus 5548s?

I see you configured an etherchannel on the trunk port but I don't see any other etherchannel or vPC related configuration in your post.

If you remove the etherchannel from the interface, does the trunk come up?

I see the 3750 is running 10Gbps, I'm assuming you have a 10Gbps interface in the 5548 as well?

Dee · ‎06-13-2012

HI,

did this get resolved?

Dee · ‎06-14-2012

fixed mine by replacing

channel-group XX mode active/or

to

Channel-group XX

If spanning tree playing up with some L2 Gateway Inconsitent,

change the spanning tree port type to normal

spanning-tree port type nornal

don't forget to make your Nexus as Spanning tree vlan XX root primary/secondary

Oleksandr Nesterov · ‎06-14-2012

As Edison mentioned the good way to check now is to remove channel-group command - since no port-channel is configured from catalyst side.

But Dion - generally dynamic port-channel configuration is more desired when configuring inter-swtich links since in most cases it will show issues between the switches.

Boxes will try to find common parameters that will be supported by both devices which can poin to misconfigs etc..

HTH

Alex