This is a short article on configuring EVPN VPWS on IOS-XR.
The configuration is very similar to IOS-XE with a local and remote target value which is used in the type 1 route as the ethernet tag ID
RP/0/RP0/CPU0:R1#show run int gi0/0/0/0
Thu Oct 6 15:25:32.710 UTC
interface GigabitEthernet0/0/0/0
l2transport
RP/0/RP0/CPU0:R1#show run l2vpn
Thu Oct 6 15:25:08.519 UTC
l2vpn
xconnect group evpn-vpws
p2p evpn1
interface GigabitEthernet0/0/0/0
neighbor evpn evi 100 target 12 source 10
RP/0/RP0/CPU0:R3#show run int gi0/0/0/0
Thu Oct 6 15:25:42.775 UTC
interface GigabitEthernet0/0/0/0
l2transport
RP/0/RP0/CPU0:R3#show run l2vpn
Thu Oct 6 15:25:21.290 UTC
l2vpn
xconnect group evpn-vpws
p2p evpn1
interface GigabitEthernet0/0/0/0
neighbor evpn evi 100 target 10 source 12
The default RT value is <ASN>:<evi> on IOS-XR just like IOS-XE. (The screenshot below uses ASN 100 and EVI 100).
Additionally, IOS-XR advertises a second extcommunity which is used to signal the MTU:
Differing MTUs on each PE does bring down the xconnect on IOS-XR:
#R3
int Gi0/0/0/0
mtu 1400
#R1
RP/0/RP0/CPU0:R1#show l2vpn xconnect detail
Thu Oct 6 15:31:20.634 UTC
Group evpn-vpws, XC evpn1, state is down; Interworking none
AC: GigabitEthernet0/0/0/0, state is up
Type Ethernet
MTU 1500; XC ID 0x2; interworking none
Statistics:
packets: received 130, sent 134
bytes: received 15160, sent 15115
EVPN: neighbor 3.3.3.3, PW ID: evi 100, ac-id 12, state is down ( all ready )
XC ID 0xa0000003
Encapsulation MPLS
Source address 1.1.1.1
Encap type Ethernet, control word disabled
Sequencing not set
Ignore MTU mismatch: Disabled
Transmit MTU zero: Disabled
LSP : Up
EVPN Local Remote
------------ ------------------------------ -----------------------------
Label 24000 24000
MTU 1500 1386
Control word disabled disabled
AC ID 10 12
EVPN type Ethernet Ethernet
------------ ------------------------------ -----------------------------
Create time: 06/10/2022 15:11:31 (00:19:48 ago)
Last time status changed: 06/10/2022 15:31:17 (00:00:02 ago)
Last time PW went down: 06/10/2022 15:31:17 (00:00:02 ago)
Error: MTU mismatched
Statistics:
packets: received 134, sent 130
bytes: received 15115, sent 15160
IOS-XR implementation of EVPN VPWS seems to resemble the LDP xconnect.
To get the equivalent of IOS-XE EVPN VPWS with no MTU checking, you would need to implement bridging instead of VPWS. We will cover bridging (E-LAN) in a subsequent article. Unfortunately you cannot commit a l2vpn bridge config on XRv9k so we can only lab this with IOS-XE.
evpn
evi 100
!
l2vpn bridge group evpn
bridge-domain evpn1
int Gi0/0/0/0
evi 100
