10-04-2012 09:17 AM - edited 03-04-2019 05:45 PM
Hi Expert,
I have got 2 pairs of stack C3750E and with qinq configuration
topology as below:
===========Site A========== ===========Site B==========
C6509(G3/1)<-->(g2/0/22)C3750E(g1/0/23)<----Service provider ME---> (g1/0/23)C3750E (g2/0/22)<--> C6509(g3/1)
Both C3750E have configured with 1504 MTU size
"system mtu 1504"
i can see SiteB's 3550 by sh cdp n,
but i cannot ping its management vlan IP through this point to point link,
any expert can help ?
configuration:
Site A C6509:
interface GigabitEthernet3/1
switchport
switchport trunk encapsulation dot1q
switchport trunk allowed vlan 50
switchport mode trunk
switchport nonegotiate
logging event link-status
load-interval 30
media-type rj45
interface Vlan50
ip address 192.168.1.1 255.255.255.0
Site A C3750E:
interface GigabitEthernet2/0/22
switchport access vlan 150
switchport mode dot1q-tunnel
switchport nonegotiate
load-interval 30
l2protocol-tunnel cdp
l2protocol-tunnel stp
l2protocol-tunnel vtp
no cdp enable
spanning-tree portfast
interface GigabitEthernet1/0/23
switchport trunk encapsulation dot1q
switchport trunk native vlan 789
switchport mode trunk
switchport nonegotiate
Site B C3750E:
interface GigabitEthernet2/0/22
switchport access vlan 150
switchport mode dot1q-tunnel
switchport nonegotiate
load-interval 30
l2protocol-tunnel cdp
l2protocol-tunnel stp
l2protocol-tunnel vtp
no cdp enable
spanning-tree portfast
interface GigabitEthernet1/0/23
switchport trunk encapsulation dot1q
switchport trunk native vlan 789
switchport mode trunk
switchport nonegotiate
Site B C6509:
interface GigabitEthernet3/1
switchport
switchport trunk encapsulation dot1q
switchport trunk allowed vlan 50
switchport mode trunk
switchport nonegotiate
logging event link-status
load-interval 30
media-type rj45
interface Vlan50
ip address 192.168.1.2 255.255.255.0
10-04-2012 09:33 AM
anyone can help
10-04-2012 11:18 AM
Hello Johnny,
your confiiguration looks like correct.
Is ping failing with any packet size or only with packet size= 1500 Bytes ?
Can you check the ARP entry in each C6509 for the remote C6509 SVI Vlan50 IP address?
Are these entries populated or not and are they correct?
If you see as CDP neighbor the remote C6509 in site B the dot1q tunnel is actually working (and also the L2 protocol tunneling configuration) so the issue is on the SVI on one of the two C6509.
Hope to help
Giuseppe
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