As seen in the attached diagram, I have two sites connected via layer 2 switch stacks. The layer 2 switch stacks are connected to a pair of 9508's via vPC. All 4 9508's are EIGRP neighbors. On the surface, everything appears to be correct. However, when load testing this design, Site 1 to Site 2 can max out the 10 Gbps connection, but Site 2 to Site 1 only hits about 4.5 Gbps. Everything is the same on both sides, from hardware to configuration. No FHRP running for VLAN 2000.
interface port-channel5
description To Layer 2 Switch
switchport
switchport mode trunk
switchport trunk allowed vlan 2000
vpc 5
!
interface Ethernet1/47
description To Layer 2 Switch Port 1/0/11 (Po5)
switchport
switchport mode trunk
switchport trunk allowed vlan 2000
channel-group 5 mode active
no shutdown
All the physical interface and port-channel interface configurations are the same as above. The SVI configuration for VLAN 2000 has nothing more than an IP address and EIGRP configuration.
vPC consistency check:
vPC status
----------------------------------------------------------------------------
Id Port Status Consistency Reason Active vlans
-- ------------ ------ ----------- ------ ---------------
5 Po5 up success success 2000
On the Layer 2 switches, all the interfaces are very basic trunk port configs only allowing VLAN 2000 on the trunk.
The odd part about this is everything was working fine until the vPC was implemented. Initially, 9508-2 and 9508-3 were the only two switches with the VLAN 2000 SVI.
Has anyone ever seen something like this? Any specific troubleshooting direction? Beyond vPC consistency checks, I'm not real sure what else to do and the consistency checks are good.
Thanks!
