Hi All,
I understand that there are two types of EoMPLS, VLAN based (VC type 4) and port based (VC type 5). However, I am a little confused on the configuration and the show command output on the router.
First Test
I tried to configure port based EoMPLS using below configuration between the PEs:
int gig0/1
service instance 10 eth
encap dot1q 10
rewrite ingress tag pop 1 sym
xconnect PE2 10 encap mpls
the output of show mpls l2transport vc 10 det is below:
PE#sh mpls l2transport vc
Local intf Local circuit Dest address VC ID Status
------------- -------------------------- --------------- ---------- ----------
Gi0/1 Eth VLAN 10 10.1.0.15 10 UP
however, when I did the debug mpls l2transport signaling message, the output is like this:
11774507: Jan 18 13:50:35.068 WIB: AToM LDP [10.1.0.15]: Sending label mapping msg
11774508: Jan 18 13:50:35.068 WIB: AToM LDP [10.1.0.15]: Sending label mapping msg vc type 5, cbit 1, vc id 10, group id 0, vc label 73, status 0x00000007/0x00000001, mtu 1500, vc handle 0xCD00000C
PE#sh mpls l2transport binding
Destination Address: 10.1.0.15, VC ID: 10
Local Label: 73
Cbit: 1, VC Type: Ethernet, GroupID: 0
MTU: 1500, Interface Desc: n/a
VCCV: CC Type: RA [2]
CV Type: LSPV [2]
Remote Label: 39
Cbit: 1, VC Type: Ethernet, GroupID: 0
MTU: 1500, Interface Desc: n/a
VCCV: CC Type: RA [2]
CV Type: LSPV [2]
I think above output is correct because based on Cisco live BRKOPT-2201, when doing xconnect under 2 service instances, then the routers will negotiate using pw type 5 (port based).
Second Test
However, I tried to do some investigation by using subinterface (using IoU), the configuration is like this:
PE1#
int eth0/0.1
xconnect 150.1.3.3 1 encap mpls
PE2#
int eth0/0.1
xconnect 150.1.1.1 1 encap mpls
PE1#sh mpls l2transport vc
Local intf Local circuit Dest address VC ID Status
------------- -------------------------- --------------- ---------- ----------
Et0/0.1 Eth VLAN 1 150.1.3.3 1 UP
Rack1R1(config-if)#
*Jan 18 14:09:04.511: AToM LDP [150.1.3.3]: Sending label mapping msg
*Jan 18 14:09:04.511: AToM LDP [150.1.3.3]: Sending label mapping msg vc type 5, cbit 1, vc id 1, group id 0, vc label 19, status 0x00000007/0x00000020, mtu 1500, vc handle 0xA0000001
*Jan 18 14:09:04.511: AToM LDP [150.1.3.3]: Sending notif msg
*Jan 18 14:09:04.511: AToM LDP [150.1.3.3]: Sending notif msg vc type 5, cbit 1, vc id 1, group id 0, vc label 19, status 0x00000007/0x00000001, mtu 1500, vc handle 0xA0000001
*Jan 18 14:09:04.551: AToM LDP [150.1.3.3]: Received notif msg, id 14
Rack1R1(config-if)#
*Jan 18 14:09:04.551: AToM LDP [150.1.3.3]: Received notif msg, id 14 vc type 5, cbit 1, vc id 1, group id 0, vc label 0, status 0x00000007/0x00000001, mtu 0, vc handle 0xA0000001
Rack1R1#sh mpls l2transport binding
Destination Address: 150.1.3.3, VC ID: 1
Local Label: 19
Cbit: 1, VC Type: Ethernet, GroupID: 0
MTU: 1500, Interface Desc: n/a
VCCV: CC Type: CW [1], RA [2]
CV Type: LSPV [2]
Remote Label: 17
Cbit: 1, VC Type: Ethernet, GroupID: 0
MTU: 1500, Interface Desc: n/a
VCCV: CC Type: CW [1], RA [2]
CV Type: LSPV [2]
I have two questions based on above result:
1. In the second test, why they negotiate to use vc type 5? based on few literatures, when using subinterface for xconnect, the router is supposed to negotiate the vc to use PW type 4 (VLAN based) right?
2. Why on first test, the local circuit (show mpls l2transport vc) shows that it is an "Eth VLAN"? I thought it means that the PW type is 4, which is VLAN based? Please correct me if I am wrong.
Local intf Local circuit Dest address VC ID Status
------------- -------------------------- --------------- ---------- ----------
Gi0/1 Eth VLAN 10 10.1.0.15 10 UP
3. How can we correctly see which PW type is used in the EoMPLS? which command to use?
Thanks.
