# VPLS with BGP and XRv RR
Load **basic.vpls.ldp.init.cfg**
```
#IOS-XE (R1-R6, CE1-3)
config replace flash:basic.vpls.ldp.init.cfg
#IOS-XR (XR1, XR2)
configure
load basic.vpls.ldp.init.cfg
commit replace
y
```
The CE routers CE1-3 are preconfigured with EIGRP.
* Configure VPLS and verify that the EIGRP neighborships come up.
* Use BGP for signaling of the service label.
* Use XR1 as the RR.
## Answer
```
#XR1
router bgp 65000
add l2vpn vpls
!
neighbor-group IBGP
remote-as 65000
update-source Loopback0
address-family l2vpn vpls-vpws
route-reflector-client
Signalling ldp disable
!
neighbor 1.1.1.1 use neighbor-group IBGP
neighbor 3.3.3.3 use neighbor-group IBGP
neighbor 5.5.5.5 use neighbor-group IBGP
#R1
router bgp 65000
neighbor 11.11.11.11 remote-as 65000
neighbor 11.11.11.11 update-so lo0
add l2vpn vpls
neighbor 11.11.11.11 activate
neighbor 11.11.11.11 suppress-signaling-protocol ldp
!
int gi4
service instance 1 eth
encap default
exit
!
l2vpn vfi context VPLS1
vpn id 100
autodiscovery bgp signaling bgp
ve id 1
!
bridge-domain 100
member gi4 service-instance 1
member vfi VPLS1
#R3
router bgp 65000
neighbor 11.11.11.11 remote-as 65000
neighbor 11.11.11.11 update-so lo0
add l2vpn vpls
neighbor 11.11.11.11 activate
neighbor 11.11.11.11 suppress-signaling-protocol ldp
!
int gi6
service instance 1 eth
encap default
exit
!
l2vpn vfi context VPLS1
vpn id 100
autodiscovery bgp signaling bgp
ve id 3
!
bridge-domain 100
member gi6 service-instance 1
member vfi VPLS1
#R5
router bgp 65000
neighbor 11.11.11.11 remote-as 65000
neighbor 11.11.11.11 update-so lo0
add l2vpn vpls
neighbor 11.11.11.11 activate
neighbor 11.11.11.11 suppress-signaling-protocol ldp
!
int gi6
service instance 1 eth
encap default
exit
!
l2vpn vfi context VPLS1
vpn id 100
autodiscovery bgp signaling bgp
ve id 5
!
bridge-domain 100
member gi6 service-instance 1
member vfi VPLS1
```
## Explanation
IOS-XR uses negative logic for the signaling protocol under l2vpn/vpls. We saw in the previous article that to use LDP, you use **signaling bgp disable**. To use BGP in this lab, we use **signaling ldp disable** in order to use BGP for signaling.
```
router bgp 65000
neighbor-group IBGP
address-family l2vpn vpls-vpws
Signalling ldp disable
```
IOS-XE uses LDP signaling by default and uses BGP with **disable-signaling-protocol ldp** on the neighbor statement.
```
router bgp 65000
add l2vpn vpls
neighbor 11.11.11.11 suppress-signaling-protocol ldp
```
The XE routers do not need to specify the XR neighbor as **prefix-length-size 2** as they did when using LDP for signaling. When using BGP for signaling, XR is expecting a prefix-len of 1 byte, so we don’t need to worry about this. However, specifying **prefix-length-size 2** does not appear to break the BGP session/updates.
When using BGP for signaling of the label, it does not seem that we can apply templates to toggle specific features, such as the CW, as we were able to do when using LDP for signaling.
```
!
! This is only available when using LDP for signaling
!
template type pseudowire NO_CW
encapsulation mpls
control-word exclude
!
l2vpn vfi context VPLS1
vpn id 100
autodiscovery bgp signaling ldp template NO_CW
```
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