Trunk connection between VSP7400 (v.8.2.0.0) and ERS 4926 (v.7.8.1.0.5

[kevin_phi]

Dear all, 

I have an issue regarding a trunk link between a VSP 7400 and ERS 4926. 

Ping doesn’t work..

vlan config on VSP
--------------------
vlan members remove 1 1/1-1/48
vlan create 201 name "VLAN_Gare" type port-mstprstp 0
vlan members 201 1/48 portmember
interface vlan 201
ip address 192.168.201.1 255.255.255.0

port trunk config on VSP
------------------------
interface gig 1/48
default-vlan-id 201
no shut

ip config on ERS
-----------------
ip default-gateway 192.168.201.1
ip address switch 192.168.201.4

vlan config on ERS
------------------------
vlan create 201 type port cist 
vlan members 1 NONE
vlan members 201 25-26
vlan mgmt 201
vlan ports 25-26 tagging tagall

Does I forgot something in the config ?
The ERS appears in the ip lldp neighbors but not in the ip arp table.
I have another ERS connected to the ERS and ping/communication works properly. 

[kevin_phi]

Hi Sam, 

It exactly this, I changed it and working fine now.

I forgot to activate the encapsulation dot1q on the VSP trunk port

Thx for your feeeback.

Kevin

[SamPirok · Accepted solution]

Hi Kevin, is the port on the VSP towards the ERS configured to tag frames (‘encapsulation dot1q’)? The ERS will likely drop untagged frames, which could be causing your issue here.