cancel
Showing results for 
Search instead for 
Did you mean: 
cancel
3879
Views
0
Helpful
1
Replies

Nexus 2148T active-active mode towards Nexus 5010 - show fex output?

andy.geraerts
Level 1
Level 1

Hello,

I'm trying to configure a Nexus 2148T to connect redundant to two different Nexus 5010's. I'm not sure if my config is correct and working :

On the active 5K :

HI15887# show fex
  FEX            FEX             FEX                  FEX              
Number       Description         State      Model            Serial    
------------------------------------------------------------------------
110        HI15885        Online      N2K-C2148T-1GE   JAF1405CKGM
111        HI15886        Online      N2K-C2148T-1GE   JAF1405ASPT

On the 'passive' 5K :

HI15888# show fex
  FEX            FEX             FEX                  FEX              
Number       Description         State      Model            Serial    
------------------------------------------------------------------------
---       --------     Connected      N2K-C2148T-1GE   JAF1405CKGM
---       --------     Connected      N2K-C2148T-1GE   JAF1405ASPT
HI15888#

But after x-minutes I see :

HI15888# show fex
  FEX            FEX             FEX                  FEX              
Number       Description         State      Model            Serial    
------------------------------------------------------------------------
---       --------       Offline      N2K-C2148T-1GE   JAF1405CKGM
---       --------       Offline      N2K-C2148T-1GE   JAF1405ASPT

Should I see the FEX on the passive 5K? Should I see it's interfaces?

I get this error in the logs :

ETHPORT-5-IF_ERROR_VLANS_SUSPENDED: VLANs 1 on Interface port-channel30 are being suspended. (Reason: vPC peer is not reachable over cfs)

However :

HI15888# show cfs peers

Physical Fabric
-------------------------------------------------------------------------
Switch WWN              IP Address            
-------------------------------------------------------------------------
20:00:00:0d:ec:ff:5f:c0 x.x.x.x                              [Local]
                         HI15888                                
20:00:00:0d:ec:ff:97:00 x.x.x.x                          

Total number of entries = 2

HI15888# show vpc
Legend:
                (*) - local vPC is down, forwarding via vPC peer-link

vPC domain id                   : 101
Peer status                     : peer adjacency formed ok     
vPC keep-alive status           : peer is alive                
Configuration consistency status: success
vPC role                        : secondary

If I enter configuration changes on a FEX interface, it's lost when I reload the Active 5K and the system fails over to the passive 5K.

Here's my config for both 5k's :

vpc domain 101
  role priority xxxx
  system-priority 4000
  peer-keepalive destination x.x.x.x
feature fex

fex 110
  pinning max-links 1
  type "Nexus 2148T"

fex 111
  pinning max-links 1
  type "Nexus 2148T"

interface port-channel30
  switchport mode trunk
  switchport trunk native vlan 999
  vpc peer-link
  spanning-tree port type network
  speed 10000

interface port-channel100
  switchport mode fex-fabric
  fex associate 110
  speed 10000

interface port-channel200
  switchport mode fex-fabric
  fex associate 111
  speed 10000

interface Ethernet1/19
  switchport mode trunk
  switchport trunk native vlan 999
  channel-group 30 mode active

interface Ethernet1/20
  switchport mode trunk
  switchport trunk native vlan 999
  channel-group 30 mode active

Thanks,

Andy.

1 Reply 1

andy.geraerts
Level 1
Level 1

To answer my own question : I forgot the vpc parameter in the Port-Channel config.

interface port-channel100
  switchport mode fex-fabric
  vpc 100
  fex associate 110
  speed 10000

After this, all seems working. I can see the FEX from both 5010's.

Config isn't synced, but ports stay down if the config isn't identical on port level.

Andy.

Getting Started

Find answers to your questions by entering keywords or phrases in the Search bar above. New here? Use these resources to familiarize yourself with the community:

Innovations in Cisco Full Stack Observability - A new webinar from Cisco