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L2VPN

Psycho_naT
Beginner
Beginner

Two configuration examples:

Example 1:

CE-A

int fa0/0

  description to PE-A

  encapsulation dot1q 400

  ip address x.x.x.x y.y.y.y

PE-A

int lo0

  ip address 10.10.10.10 255.255.255.255

int fa0/9

  description to CE-A

  switchport

  switchport trunk encapsulation dot1q

  switchport trunk allowed vlan 400

  switchport trunk mode trunk

int vlan 400

  xconnect 10.20.20.20 400 encapsulation mpls

PE-B

int lo0

  ip address 10.20.20.20 255.255.255.255

int fa0/10

  description to CE-B

  switchport

  switchport trunk encapsulation dot1q

  switchport trunk allowed vlan 400

  switchport trunk mode trunk

int vlan 400

  xconnect 10.10.10.10 400 encapsulation mpls

CE-B

int fa0/1

  description to PE-B

  encapsulation dot1q 400

  ip address x.x.x.x y.y.y.y

Example 2:

CE-A

int fa0/0

  description to PE-A

  ip address x.x.x.x y.y.y.y

PE-A

int lo0

  ip address 10.10.10.10 255.255.255.255

int fa0/9

  description to CE-A

  switchport

  switchport access vlan 400

  switchport mode access

int vlan 400

  xconnect 10.20.20.20 400 encapsulation mpls

PE-B

int lo0

  ip address 10.20.20.20 255.255.255.255

int fa0/10

  description to CE-B

  switchport

  switchport access vlan 400

  switchport mode access

int vlan 400

  xconnect 10.10.10.10 400 encapsulation mpls

CE-B

int fa0/1

  description to PE-B

  ip address x.x.x.x y.y.y.y

What mode of EoMPLS is using in this examples (port-based or VLAN-based) ?

In what exampe vlan tag removed or not from frame received from customer ?

1 Accepted Solution

Accepted Solutions

Hi

EoMPLS supports two pseudowires type: - PW VC Type 5 known as port mode - PW VC type 4 known as VLAN mode Each VC type has a different behavior regarding tags manipulation which comes on top of tags manipulation done at the Attachment Circuit (AC) level.

Based on RFC 4448, an Ethernet PW can operate in two different modes:

- Raw mode or VC Type 5

- Tagged mode or VC Type 4

( http://www.mplsvpn.info/2009/12/modes-of-ethernet-over-mpls-eompls.html )

The main difference is in raw mode the service delimiter tag (outer tag) must not be propagated and in  tagged mode the service delimiter tag must be kept  to the frame before forwarding it into the PW. Those operations are independant from other tags manipulation that could happen at the AC level.

VC type 5 no tag is carried where as in VC type 4 tag is carried forward.

As per my understanding you are looking for the documents which could demonstrate VC type 4 and VC type 5. If something else is required, please let me know. Will happy to help you on that part too.

http://fengnet.com/book/layer%202%20vpn%20architectures/ch07lev1sec2.html

The above mentioned link is having both examples of VC type 4 and VC type 5.

regards

shivlu jain

www.mplsvpn.info

View solution in original post

9 Replies 9

shivjain
Cisco Employee
Cisco Employee

This seems to be Vlan based.

http://www.mplsvpn.info/2009/12/modes-of-ethernet-over-mpls-eompls.html

regards

shivlu jain