1. 67th IETF - San Diego, CA, USA
MAC Hiding in an H-VPLS Environment draft-cowburn-l2vpn-vpls-ldp-mac-hiding-01.txt
Ian Cowburn
Contributors: Richard Foote Prashanth Ishwar Vipin Jain Marc Lasserre Koosh Mohajeri John Rigby
67th IETF - San Diego, CA, USA

2. 67th IETF - San Diego, CA, USA
Problem Statement
draft-ietf-l2vpn-vpls-ldp-09.txt defines a 2 level hierarchy for VPLS
Spoke MTU-s to fully meshed PE-rs core
PE-rs learns MAC addresses for customers on its directly attached MTU-s and the remote MAC addresses for all of its configured VPLS instances.
Can result in requirement to store a large number of MACs
67th IETF - San Diego, CA, USA

3. 67th IETF - San Diego, CA, USA
Solution
Assign identifier to MTU-s (MTU-id)
Include source & destination identifier with frames using control word
Switch at PE-rs based on destination MTU-ids
PE-rs learns only MTU-ids, not customer MACs
67th IETF - San Diego, CA, USA

4. 67th IETF - San Diego, CA, USA
Benefits
Extends scalability of H-VPLS
MAC scaling on PE-rs
Minimized additional overhead per frame (4 bytes)
Using standard techniques
New use of Ethernet control word
67th IETF - San Diego, CA, USA

5. 67th IETF - San Diego, CA, USA
What is covered
Signalling MAC hiding ability via LDP (RFC4447)
Actions at MTU-s and PE-rs
Handling broadcast, unknown, multicast
MTU-id specific MAC withdraw
Inter-provider use
67th IETF - San Diego, CA, USA

6. Life of a Frame: MTU-s to MTU-s
X to Y DA SA VC
Label
Tunnel
0x8847
DA’
SA’
3FFF 18
Input
MTUid
PW1b
PE-B Y X 20
Input
MTUid
PW2b 18
PE-C
MAC
VLAN
Input
MTUid X 20
PW3b 18
MTU-D Y X
MTU-A
MAC
VLAN
Input
MTUid 20
port0 Y X 20
MTUid=18
MTUid=28
CPE
MTU-A
PE-B
PE-C
MTU-D
CPE X Y
Provider’s MPLS Backbone
port0
PW1a
PW1b
PW2a
PW2b
PW3a
PW3b
port1
67th IETF - San Diego, CA, USA

7. Life of a Frame: MTU-s to MTU-s
Y to X DA SA VC
Label
Tunnel
0x8847
DA’
SA’ 18 28
PW3a X Y 20 Y 20
PW1a 28
PW2a 28 X Y 20 Y 20
port1 X
MTUid=18
MTUid=28
CPE
MTU-A
PE-B
PE-C
MTU-D
CPE X Y
Provider’s MPLS Backbone
port/0
PW1a
PW1b
PW2a
PW2b
PW3a
PW3b
port1
MTU-A
PE-B
PE-C
MTU-D
MAC
VLAN
Input
MTUid
Input
MTUid
Input
MTUid
MAC
VLAN
Input
MTUid X 20
port0
PW1b 18
PW2b 18 X 20
PW3b 18
67th IETF - San Diego, CA, USA

8. 67th IETF - San Diego, CA, USA
Next steps
Solicit comments on L2VPN list
67th IETF - San Diego, CA, USA