Supporting IP Multicast over VPLS draft-serbest-l2vpn-vpls-mcast-01.txt - PowerPoint PPT Presentation

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Supporting IP Multicast over VPLS draft-serbest-l2vpn-vpls-mcast-01.txt

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Title: No Slide Title Author: Serbest, Yetik Last modified by: Serbest, Yetik Created Date: 11/4/2004 4:00:29 PM Document presentation format: On-screen Show – PowerPoint PPT presentation

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Title: Supporting IP Multicast over VPLS draft-serbest-l2vpn-vpls-mcast-01.txt


1
Supporting IP Multicast over VPLSdraft-serbest-l2
vpn-vpls-mcast-01.txt
  • Suresh Boddapati
  • Venu Hemige
  • Sunil Khandekar
  • Vach Kompella
  • Marc Lasserre
  • Rob Nath
  • Ray Qiu
  • Yetik Serbest

2
Multicast Traffic over VPLS
  • The flooding of a frame occurs when
  • The destination MAC address has not been learned
  • The destination MAC address is a broadcast
    address
  • The destination MAC address is a multicast
    address
  • ? Flooding is the solution today

3
Problem Definition
  • Objective
  • Do not send traffic to sites without receivers
  • Keep core P routers stateless (Multicast)
  • Reduce BW waste
  • Constraints
  • In VPLS, ingress replication is required
  • Note There is no layer-3 adjacency (e.g., PIM)
    between a CE and a PE

4
A Solution
  • IGMP and/or PIM Snooping
  • Basic idea Snoop IGMP and PIM messages to
    determine which sites to send the traffic to
  • Benefits
  • Prevents sending multicast traffic to sites with
    no members
  • Keeps P routers in the core stateless
  • Improves VPLS to support IP multicast more
    efficiently
  • SP does not need to perform the tasks to provide
    multicast service (e.g., running PIM, managing
    P-group addresses, managing multicast tunnels)
  • SP does not need to maintain PIM adjacencies with
    the customers

5
An Application IPTV
DSLAM
VSO
L2-PE
Copper
GigE
VSO
L2-PE
VPLS (IGMP Snooping)
L2-PE
Video
VHO
VSO
SHE
IP/MPLS Backbone with MCAST Support
L2-PE
PE
VSO
Internet
20-25Mbps
6
An Application Router Inter-connect with PIM
L2-PE
PIM
Site B
L2-PE
VPLS (PIM Snooping)
L2-PE
PIM
L2-PE
PIM
Site A
L2-PE
Site C
7
Issues Addressed in v01
  • IGMP Snooping
  • Reports are sent to all mcast routers
  • MRDP, static conf, PIM Hello Snooping to learn
    mcast routers
  • Explicitly stated Holddown timer for IGMP leave
  • If a mcast router and a host are connected to a
    CE (layer-2 switch), that layer-2 switch MUST do
    IGMP snooping
  • IGMPv3 reports/leaves are elaborated and the
    example is updated accordingly
  • PIM Snooping
  • To avoid PIM Join Suppression, PIM Joins are
    forwarded to Upstream Neighbor Address

8
Duplicate Traffic (PIM-SSM)
PE2
R3
R1
VPLS
PE1
R2
Src
PE3
R4
9
Duplicate Traffic (PIM-SM)
PE2
R3
R1
PE1
VPLS
R2
Src
PE3
R4
RP
R5
10
Issues Addressed in v01 (cont.)
  • Proposal for Duplicate Traffic Problem
  • Detect it, and drop the traffic coming from the
    AC/PW which is not associated with Upstream
    Neighbor Address
  • Trigger Assert by Flushing (by defining TLV)
    the snooping state
  • Directly connected sources
  • Need to send traffic to all mcast routers
  • May not happen with the current guidelines
  • Proposals to detect directly connected sources
  • ARP snooping
  • Static configuration
  • Do not allow it

11
Next Steps
  • Please comment
  • Requirements?
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