Hi, I had some trouble while deploying vPC and here is my network topology：
I have two nexus 7009 as core switch, both of them are vPC enable and vPC adjacency formed ok.
The switch-B (2960-S) dual-home to two n7k, the uplink ports are config as normal port-channel on 2960 and vPC on N7K. While I connecting a PC on either N7k-1 or N7K-2 and accessing to server A or server B , everthing works fine.
After that I have a access switch (switch-A) dual-home to two n7k, and the uplink ports are config same as the switch-B, the host-A can accsee both server behind switch-B.
but for some reason, the link toward to the n7k-2 was removed. Since that the host behind the switch-A accessing the server which behind the switch-B seems unusual. some of them can access all server but some of them cannot!
While I show ip arp on both n7k, I found that arp table are not sync. for some client , I can ping it either on n7k-1 or n7k-2. When I try to ping those client on server, and debuging ip packet on two n7k, the switch-B choose n7k-2 as next hop ( base on hash algorithm), I can get debuging message on n7k-2 but not on n7k-1, it seems that n7k-2 not passing that packet to n7k-1 or n7k-1 drop that packet? So I try the same action on other server, this time the switch-B choose the n7k-1 as the next hop and I get debuging message on n7k-1, the server can also get ICMP relay.
The same thing happen while client acquiring IP using core-switch as dhcp-relay, some client can't receive the DHCP offer, but I actually capture the DHCP discover & offer packet on the DHCP server! I was totally confused……
Can somebody tell me why that happen? and how to fix it?
Here is the port-channel config:
interface port-channel 2
switchport mode trunk
switchport mode trunk
storm-control broadcast level 40.00
Here is show vpc output
vPC domain id : 10
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 : success
vPC role : primary
Number of vPCs configured : 31
Peer Gateway : Enabled
Peer gateway excluded VLANs : -
Dual-active excluded VLANs : -
Graceful Consistency Check : Enabled
Auto-recovery status : Enabled (timeout = 240 seconds)
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