Router L2 extension Problems

[Fernando Ramiro]

Anyone know how i can establish a lan extender between 2 routers conected wit subinterface on wan port in encapsulation dot1q. I need to host connected in R1 ping host connected in R2 but in same network.

[MHM Cisco World]

https://www.cisco.com/c/en/us/support/docs/lan-switching/integrated-routing-bridging-irb/200650-Understanding-Bridge-Virtual-Interface.html

answer is this link

[Fernando Ramiro]

actually i have this scenario:

R1
Interface IP-Address OK? Method Status Protocol
GigabitEthernet0/0/0 unassigned YES NVRAM up up
Gi0/0/0.10 10.0.0.20 YES manual up up
GigabitEthernet0/1/0 unassigned YES unset up up
GigabitEthernet0/1/1 unassigned YES unset down down
GigabitEthernet0/1/2 unassigned YES unset down down
GigabitEthernet0/1/3 unassigned YES unset down down
Loopback1 10.10.10.20 YES NVRAM up up
Vlan1 10.75.76.252 YES manual up up

R2
Interface IP-Address OK? Method Status Protocol
GigabitEthernet0/0/0 unassigned YES NVRAM up up
Gi0/0/0.10 10.0.0.10 YES manual up up
GigabitEthernet0/1/0 unassigned YES unset up up
GigabitEthernet0/1/1 unassigned YES unset down down
GigabitEthernet0/1/2 unassigned YES unset down down
GigabitEthernet0/1/3 unassigned YES unset down down
Loopback1 10.10.10.10 YES NVRAM up up
Vlan1 10.75.76.253 YES manual up up

I have ping between loopback interface and Gi0/0/0.10 on both.

but have no pings between vlan 1. I try to configure a l2tp tunnel:

R1:

l2tp-class GNR
retransmit initial retries 30

pseudowire-class GNR
encapsulation l2tpv3
protocol l2tpv3 GNR
ip local interface Loopback1
ip pmtu

R2:

l2tp-class GNR
retransmit initial retries 30

pseudowire-class GNR
encapsulation l2tpv3
protocol l2tpv3 GNR
ip local interface Loopback1
ip pmtu

But, have no sucess to ping vlans. I have l2tp tunnel up:

L2TP Tunnel Information Total tunnels 1 sessions 1

LocTunID RemTunID Remote Name State Remote Address Sessn L2TP Class/
Count VPDN Group
1461291325 1650804468 R1 est 10.10.10.20 1 GNR

and routes :

10.0.0.0/8 is variably subnetted, 6 subnets, 3 masks
C 10.0.0.0/24 is directly connected, GigabitEthernet0/0/0.10
L 10.0.0.10/32 is directly connected, GigabitEthernet0/0/0.10
C 10.10.10.10/32 is directly connected, Loopback1
S 10.10.10.20/32 [1/0] via 10.0.0.20
C 10.75.76.248/29 is directly connected, Vlan1
L 10.75.76.253/32 is directly connected, Vlan1

this solution will work for me!?

[MHM Cisco World]

since you have L3 connect between the two router then 
L2tpv3 is best solution.

https://www.cisco.com/c/en/us/support/docs/ip/layer-two-tunnel-protocol-l2tp/116266-configure-l2-00.html

[Fernando Ramiro]

But both main interface on routers are sub.interfaces. i have tunnel up but no traffic between vlans.

[Georg Pauwen]

Hello,

post the full running configs (sh run) of both routers...

[MHM Cisco World]

*Ge0/1 in both router must not have any IP
**if the R1->R2 and R2->R1 is SVI you can use it "check by ping from one router to other using SVI".
***xconnect is as following  
xconnect x.x.x. encapsulation l2tpv3 manual pw-class x

[Fernando Ramiro]

Routers sh ru

[MHM Cisco World]

You config is prefect 
*can you ping Lo form one router to other ??

**if config is not work try manual 

xconnect x.x.x. encapsulation l2tpv3 manual pw-class x

l2tp id y z <- since it manual you need this and in other router use "l2tp id z y"

***if both using protocol or manual not work then 
check the router ver and license because as I read l2tpv3 for some router need data license.

[Fernando Ramiro]

Yes, i can ping Lo between routers, i have the tunnel up but cant ping other vlan or host. i see this messagem now: 

*Jul 3 22:30:32.948: %IOSXE-5-PLATFORM: R0/0: cpp_cp: QFP:0.0 Thread:000 TS:00000025548423024200 %PUNT_INJECT-5-DROP_PUNT_CAUSE: punt policer drops packets, cause: l2cp (0x4d) from GigabitEthernet0/1/0

and for Manual configuration on xconnect i have this message: 

R2(config-if)#xconnect 10.10.10.20 1 encapsulation l2tpv3 manual pw-class GNR
Mismatched signaling protocols between Xconnect, pw-class configs
Pseudowire class encap not matching with PW infoencap

i dont know what is wrong with this and need to put in production.

[MHM Cisco World]

https://bst.cisco.com/bugsearch/bug/CSCvj62552

for manual 

l2tp-class GNR
retransmit initial retries 30

pseudowire-class GNR
encapsulation l2tpv3
protocol l2tpv3 GNR<-only remove this and try manual
ip local interface Loopback1
ip pmtu

[Fernando Ramiro]

same error!

i add routes to specific:

ip route 10.75.76.252 255.255.255.255 10.0.0.10 ->R1

ip route 10.75.76.253 255.255.255.255 10.0.0.20 ->R2

and i have ping, but if i have this routes and can send/receive packets, my new doubt is:

my gw are these two addresss. 10.75.76.253 on R2 and 10.75.76.254 on R1 for host. If i connect a SW in one side this default-gw is one of these address, all network above will be conected to the other side!?

[MHM Cisco World]

 last night I think and check a lot of ccie note, you want VLAN in both Router to interconnect and you want GW to be SVI in each router,

for vlan with GW 

interface vlan x

no ip address

xconnect .....

for vlan with GW

TRY this way 

interface Vlanx

ip address x.x.x.x/y

bridge-group 1
!
bridge-group 1
xconnect 

[Fernando Ramiro]

same error.

[MHM Cisco World]

I do lab using Lo and I was success to pass from side to side.