We have a vPC cluster of two Nexus 7009 that needs to be connected with a VSS cluster of two Catalyst 6509s. The VSS has been working fine for a while and the vPC cluster is new equipment.
Attached there is a detailed diagram of the connections; the VSS cluster connects the interfaces Ten1/2/8 and Ten 2/2/8 using the PortChannel 28 going to the the vPC cluster to the interfaces Eth 4/18 of each switch.
Both the vPC and the VSS are well configured; last night we tried to brought up the connection between the two clusters but only the first interface comes up within the etherchannel; the secondary one did not come up and shows (not receiving LACP packets).
We know Layer 1 is fine because if we remove the interface from the EtherChannel it does come up; but causes some STP loop and bring the network down; thus the solution is to form a EtherChannel.
At the VSS Clúster we see LACP packets being sent with sh lacp counters but we DO NOT see LACP packets being received in the interface of the secondary Nexus.
Right now, this is not possible to troubleshoot since it is a production enviroment; so I'm looking for problems with the configuration or recommendations to follow in order to apply them tomorrow night during a new maintenance window.
These are the configurations:
#######vPC cluster of Nexus 7009######
--N7K-1--
interface port-channel418
description Uplink 20 GE hacia VSS
switchport
switchport mode trunk
switchport trunk allowed vlan 1,4,10,17,35,37,39,60,63,100,112
switchport trunk allowed vlan add 120,149-152,154-160,163-164,170
switchport trunk allowed vlan add 172,190,200,801,900,905,910,920
switchport trunk allowed vlan add 925,960
spanning-tree port type network
vpc 418
no shut
interface Ethernet4/18
description Uplink 10 GE hacia VSS-1 Ten 1/2/8
switchport
switchport mode trunk
switchport trunk allowed vlan 1,4,10,17,35,37,39,60,63,100,112
switchport trunk allowed vlan add 120,149-152,154-160,163-164,170
switchport trunk allowed vlan add 172,190,200,801,900,905,910,920
switchport trunk allowed vlan add 925,960
rate-mode dedicated force
udld aggressive
channel-group 418 mode active
no shutdown
--N7K-2--
interface port-channel418
description Uplink 20 GE hacia VSS
switchport
switchport mode trunk
switchport trunk allowed vlan 1,4,10,17,35,37,39,60,63,100,112
switchport trunk allowed vlan add 120,149-152,154-160,163-164,170
switchport trunk allowed vlan add 172,190,200,801,900,905,910,920
switchport trunk allowed vlan add 925,960
spanning-tree port type network
vpc 418
interface Ethernet4/18
description Uplink 10 GE hacia VSS-2 Ten 2/2/8
switchport
switchport mode trunk
switchport trunk allowed vlan 1,4,10,17,35,37,39,60,63,100,112
switchport trunk allowed vlan add 120,149-152,154-160,163-164,170
switchport trunk allowed vlan add 172,190,200,801,900,905,910,920
switchport trunk allowed vlan add 925,960
rate-mode dedicated force
udld aggressive
channel-group 418 mode active
no shutdown
#######vPC cluster of Nexus 7009######
interface TenGigabitEthernet1/2/8
description CONEXION HACIA ETHERNET 4/1 NEXUS 7K PRIMARIO CAP
switchport
switchport trunk encapsulation dot1q
switchport trunk allowed vlan 1,4,10,17,35,37,39,60,63,100,112,120,149-152
switchport trunk allowed vlan add 154-160,163,164,170,172,190,200,801,900,905
switchport trunk allowed vlan add 910,920,925,960
switchport mode trunk
no shutdown
udld port aggressive
storm-control broadcast level 1.00
channel-group 28 mode active
interface TenGigabitEthernet2/2/8
description CONEXION HACIA ETHERNET 4/1 NEXUS 7K SECUNDARIO CAP
switchport
switchport trunk encapsulation dot1q
switchport trunk allowed vlan 1,4,10,17,35,37,39,60,63,100,112,120,149-152
switchport trunk allowed vlan add 154-160,163,164,170,172,190,200,801,900,905
switchport trunk allowed vlan add 910,920,925,960
switchport mode trunk
no shutdown
udld port aggressive
storm-control broadcast level 1.00
channel-group 28 mode active
interface Port-channel28
description Trunk hacia Switches NEXUS 7K CAP
switchport
switchport trunk encapsulation dot1q
switchport trunk allowed vlan 1,4,10,17,35,37,39,60,63,100,112,120,149-152
switchport trunk allowed vlan add 154-160,163,164,170,172,190,200,801,900,905
switchport trunk allowed vlan add 910,920,925,960
switchport mode trunk
