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nexus and 4500 connectivity

ring zer0
Level 1
Level 1
I have 2 Nexus 9K to be bundled together using vPC.
First Nexus:
vrf context management
  ip route 0.0.0.0/0 172.25.100.1
vpc domain 1
  peer-keepalive destination 172.25.100.2
interface port-channel1 ----<<< 2x10G connected to other nexus
  switchport mode trunk
  spanning-tree port type network
  vpc peer-link
interface mgmt0 -----<<< Connected to other nexus
  vrf member management
  ip address 172.25.100.3/24
Second Nexus:
vrf context management
  ip route 0.0.0.0/0 172.25.100.1
vpc domain 1
  role priority 1000
  peer-keepalive destination 172.25.100.3
interface port-channel1 ----<<< 2x10G connected to other nexus
  switchport mode trunk
  spanning-tree port type network
  vpc peer-link
interface mgmt0 -----<<< Connected to other nexus
  vrf member management
  ip address 172.25.100.2/24
line console
The show vpc and vpc keepalive all shows fine. Now with the access level I have 2 4500, I have configured them as VSS which makes them 1 logically. I want to connect them with the nexus, I have configured normal LACP-Portchannel on 4500 (2 ports total) and connected the first cable to first nexus while the second cable is connected to second nexus. Below is nexus config
First Nexus:
interface port-channel10
  description to Core
  switchport mode trunk
interface Ethernet1/46
  description to Core1
  switchport mode trunk
  channel-group 10 mode active

Second Nexus:
interface port-channel10
  description to 4500
  switchport mode trunk

interface Ethernet1/46
  description to Core2
  switchport mode trunk
  channel-group 10 mode active
I created SVI on 4500 with VLAN1 and also on SVI on Nexus. Tried to ping and it works fine both ways and I believe all is working as expected, below is show vpc information.
NK9-2# sh vpc
Legend:
                (*) - local vPC is down, forwarding via vPC peer-link
vPC domain id                     : 1
Peer status                       : peer adjacency formed ok
vPC keep-alive status             : peer is alive
Configuration consistency status  : success
Per-vlan consistency status       : success
Type-2 consistency status         : failed
Type-2 inconsistency reason       : SVI type-2 configuration incompatible
vPC role                          : secondary
Number of vPCs configured         : 0
Peer Gateway                      : Disabled
Dual-active excluded VLANs        : -
Graceful Consistency Check        : Enabled
Auto-recovery status              : Disabled
Delay-restore status              : Timer is off.(timeout = 30s)
Delay-restore SVI status          : Timer is off.(timeout = 10s)
vPC Peer-link status
---------------------------------------------------------------------
id   Port   Status Active vlans
--   ----   ------ --------------------------------------------------
1    Po1    up     1

NK9-2# sh vpc peer-keepalive
vPC keep-alive status             : peer is alive
--Peer is alive for             : (5342) seconds, (785) msec
--Send status                   : Success
--Last send at                  : 2016.06.29 16:18:00 482 ms
--Sent on interface             : mgmt0
--Receive status                : Success
--Last receive at               : 2016.06.29 16:18:00 482 ms
--Received on interface         : mgmt0
--Last update from peer         : (0) seconds, (36) msec
vPC Keep-alive parameters
--Destination                   : 172.25.100.2
--Keepalive interval            : 1000 msec
--Keepalive timeout             : 5 seconds
--Keepalive hold timeout        : 3 seconds
--Keepalive vrf                 : management
--Keepalive udp port            : 3200
--Keepalive tos                 : 192
My question here is to confirm if i have setup the things properly or I need to connect the 4500 in a different way . I understand that it shows Type-2 consistency status failed and thats because of config mismatch and I am working on it.
3 Replies 3

Mark Malone
VIP Alumni
VIP Alumni

Hi you could have a standard po on 4500 side with vpc po on nexus going back to 4500 that will work and utilize vpc feature

but if I configure a standard PO on 4500 and standard PO on Nexus (the way I have done in my config). connectivity will still work?

I would set it as vpc , have you checked stp has not blocked vlans somewhere with that setup between the 3 devices, vpc eliminates stp , all our setups consist of vpc po to standard pos  where there is a standard switch/server etc connected directly to nexus switches, it will work but maybe not as optimally when set as vpc po

A vPC provides the following benefits:

• Allows a single device to use a PortChannel across two upstream devices

• Eliminates Spanning Tree Protocol blocked ports

• Provides a loop-free topology

• Uses all available uplink bandwidth

• Provides fast convergence if either the link or a device fails

• Provides link-level resiliency

• Helps ensure high availability