Native VLAN missmatch on Metro Ethernet Service

[ajishidiq]

Dear

we have a curious problem regarding metro service that connect remote sites (through 3600 and 3750) and the head office (xconnect with asr9010).

here is the configuration :

RP/0/RSP0/CPU0:MyPoP-ASR9010-NPE-01#sh run l2vpn bridge group MyComp bridge-domain XC-Cust-P2MP neighbor [UPE IP] pw-id [XC]
Sun Jul 31 17:02:58.955 WIB
l2vpn
 bridge group MyComp
  bridge-domain XC-Cust-P2MP
   neighbor [UPE IP] pw-id [XC]
    split-horizon group
   !

myPoP-ME3600-UPE-01#sh run int g0/20 | sec service instance [XC]
 service instance [XC] ethernet
  encapsulation dot1q [XC]
  rewrite ingress tag pop 1 symmetric
  xconnect [ASR IP] [XC] encapsulation mpls


from 3600 we connected 2960 and have this log :

Jul 31 00:05:44 WIB: %CDP-4-NATIVE_VLAN_MISMATCH: Native VLAN mismatch discovered on GigabitEthernet0/23 (1), with router.user FastEthernet3 (30).
Jul 31 00:06:44 WIB: %CDP-4-NATIVE_VLAN_MISMATCH: Native VLAN mismatch discovered on GigabitEthernet0/23 (1), with router.user FastEthernet3 (30).
Jul 31 00:08:44 WIB: %CDP-4-NATIVE_VLAN_MISMATCH: Native VLAN mismatch discovered on GigabitEthernet0/23 (1), with router.user FastEthernet3 (30).
Jul 31 00:10:45 WIB: %CDP-4-NATIVE_VLAN_MISMATCH: Native VLAN mismatch discovered on GigabitEthernet0/23 (1), with router.user FastEthernet3 (30).
Jul 31 00:11:45 WIB: %CDP-4-NATIVE_VLAN_MISMATCH: Native VLAN mismatch discovered on GigabitEthernet0/23 (1), with router.user FastEthernet3 (30).

I have apply this config on 2960 :

C2960-CPE-01#sh run int g0/23
Building configuration...

Current configuration : 239 bytes
!
interface GigabitEthernet0/23
 switchport trunk allowed vlan xx,xx,xx,xx,xx,xx,[XC]
 switchport mode trunk
 load-interval 30
 spanning-tree bpdufilter enable
end

without spanning-tree bpdufilter enable, vlan [XC] will be blocked.


did you have same experience with us and what is the solution.

thank you

[Philip D'Ath · Accepted solution]

The customer is using a different native lan (you are using 1 and they are using 30).  Easiest fix for you is probably:

interface GigabitEthernet0/23
  no cdp enable

[ajishidiq]

thanks Philip,

even though CDP was not enable on the interface, this vlan still be blocked,

then I try to reclean my configuration on bridge domain in ASR9k I found miss config then I fix it

the miss config is make some branch become HUB by applying no split horizon and I am sure on that branch use switch that connect to other ISP.

after that the user seems happy coz no ticket (down cause vlan blocked or intermitten) till now