10-18-2019 12:09 PM
I need assistance.
I am trying ti implement two Nexus 5k into my network. I'm connecting them to a pair of 6509s running in VSS mode. Whenever I turn on the portchannel the ports go into error disabled mode.
Here are the configs for the connections:
On 6509:
interface Port-channel500
switchport
switchport trunk encapsulation dot1q
switchport trunk allowed vlan 55
switchport mode trunk
interface TenGigabitEthernet1/4/6
description uplink to N5K-Sw2
switchport
switchport trunk encapsulation dot1q
switchport trunk allowed vlan 55
switchport mode trunk
channel-group 500 mode on
interface TenGigabitEthernet2/4/6
description link to N5K-Sw1
switchport
switchport trunk encapsulation dot1q
switchport trunk allowed vlan 55
switchport mode trunk
channel-group 500 mode on
on N5K-1:
interface port-channel1
switchport mode trunk
switchport trunk allowed vlan 55
spanning-tree port type network
speed 10000
interface Ethernet1/37
switchport mode trunk
switchport trunk allowed vlan 55
channel-group 1
on N5K-2:
interface port-channel1
switchport mode trunk
switchport trunk allowed vlan 55
spanning-tree port type network
speed 10000
interface Ethernet1/37
switchport mode trunk
switchport trunk allowed vlan 55
channel-group 1
Between the two 5Ks there is a VPC peer-link:
interface port-channel10
switchport mode trunk
switchport trunk allowed vlan 55
spanning-tree port type network
speed 10000
vpc peer-link
interface Ethernet1/40
description up link to N5k-Sw1
switchport mode trunk
switchport trunk allowed vlan 55
channel-group 10
10-18-2019 12:33 PM
10-18-2019 12:48 PM
10-18-2019 01:00 PM
10-18-2019 01:34 PM
I shut the port down temporarily
10-18-2019 01:42 PM - edited 10-18-2019 01:43 PM
Use "spanning-tree port type normal" to disable Bridge Assurance on Nexus side or "spanning-tree portfast network" to enable it on Catalyst side.
10-18-2019 04:43 PM
Try 6500 side example :
interface TenGigabitEthernet1/4/6
description uplink to N5K-Sw2
switchport
switchport mode trunk
switchport trunk allowed vlan 55
channel-group 500 mode active
N5K side :
interface Ethernet1/37
switchport mode trunk
switchport trunk allowed vlan 55
channel-group 1 mode active
make sure VLAN 55 added on both the side.
once you changed the config in shutdown mode, bring up the port-channel
and post the logs - what is the reason of err-disabled
show spanning-tree vlan 55 ( 6500 and Nexus 5K)
show vpc from both 5K
10-22-2019 09:08 AM
10-22-2019 01:05 PM
I would like to config couple of testing before we proceed further.
1. What happend if you shutdown 2/4/6, will 1/4/6 come up ? YES or NO ?
2. Do you see any Logs on nexus, try command show logging last 20 both the side post the logs here
3. Hope you have VSS 6509 - they are terminating to 2 5K(they are vPC)
so you need to change the config both the 5K.
interface port-channel1
switchport mode trunk
switchport trunk allowed vlan 55
spanning-tree port type normal
speed 10000
vpc 10
10-22-2019 02:13 PM
10-23-2019 12:24 AM
What happend if you shutdown 2/4/6, will 1/4/6 come up ? YES or NO ? NO
BB - in this case you need to investigate physical connection, this not related to config.
this is basic requirement, before you put them in port-channel
BB - on Nexus side you need to add vPC config as suggested, ( once your physical or other problem fixed)
are you running any HSRP ? i see some logs in your last message ?
N5K-Sw2 %ARP-3-DUP_SRC_IP_PROBE: arp [3458] Duplicate add
ress Detected. Probe packet received from 0c27.24cf.1138 on Vlan55(port-channel
10) with destination set to our local ip, 172.16.55.11
10-23-2019 02:11 PM
10-23-2019 02:10 PM
That worked. The hardware failure was the 10g gbic in the 6509. I swapped it out and added the vpc to the 5k links and it worked. Thank you for the help.
10-23-2019 02:18 PM
Glad all working as expected, of the solution worked, can we mark as resolved- so other community members can use same solution.
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