02_9_anycast RP

2019年7月27日 02:18 作者：金淼淋分类：Multicast  525

YES LAE
Anycast RP

Objectives
YES LAB
Upon completion of this section, you will be
able to perform the following tasks:
— Explain the principles of MSDP
— Describe the use of MSDP for Anycast RP failover
configuration

MSDP Overview
YES LAB
• Works with PIM Sparse mode only
— RP knows about all sources in a domain via
PIM Register messages from first hop routers
— RP knows about receivers in a domain via ( * , G)
Join from last hop routers
Source Active (SA) messages to
- uses MSDP
tell RPs in other domains about its sources
MSDP peers talk via TCP connections

MSDP Overview (Cont.)
MSDP peers
Source Active
Messages
Domain C
Domain B
Domain
YES LAB
Domain E
JOIn C, 224.2.2.2)
Domain D

MSDP Overview (Cont.)
MSDP peers
Source Active
Messages
Domain B
SA
SA Message
192.1.1.1, 224.2.2.2
Domain C
SA Message
192.1.i.i, 224.2.2.2
Domain
YES LAB
Domai
Domain D

MSDP Overview (Cont.)
YES LAB
MSDP peers
Source Active
Messages
Domain B SA
SA
Domai
Domain C
Domain D
Domain

MSDP Overview (Cont.)
MSDP peers
Domain B
s
Domain C
Rp
Domain
YES LAB
Domain E
Domain D

MSDP Overview (Cont.)
YES LAB
Domain E
MSDP peers
Multicast Tramc
Domain C
Rp
Domain B
Domain D
s
Domain

MSDP Application—Anycast
YES LAB
• More than one Rendezvous Point (RP)
deployed for the same group range
• Each RP has the same IP address (one ip pim
rp-address command)—logical RP
• Sources and receivers use closest RP (according
to unicast information)
• Used to provide redundancy and efficient RP
load sharing in a domain

MSDP Application—Anycast RP (
YES LAB
• Sources from one RP are known to other RPs
using MSDP
• When one RP goes down, sources and
receivers are taken to a new RP
• The switchover is done as fast as unicast
routing convergence
• Logically, RP is reachable as long as at least one
of the physical RPs is alive

Anycast RP—Convergenc
YES LAB
RP2
10.0.0.1
10.0.0.1
• Internal
is run between RPs; if more than
MSDP session
two RPs, MSDP mesh group is used

Anycast RP—Convergence (Co«
RP2
10.0.0.1
Rec
Rec
Receivers Join to the closest RP
Sources Register with the closest RP; SA messages
originated

Anycast RP—Convergence (Co«
Rec
Rec
Rec
Rec
Receivers Join to the closest RP
RP2
10.0.0.1
Sources Register with the closest RP; SA messages
originated

Anycast RP—Convergence (Co«
Rec
Rec
RP2
10.0.0.1
Rec -
Rec
S rc
The loss of one RP unnoticed by sources and receivers
since underlying unicast topology converges fast

Summary
YES LAB
— MSDP protocol makes interdomain multicast
possible by exchange of Source Active messages
— MSDP is needed in the Anycast-RP solution (failover
mechanism of statically configured RPs)

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02_9_anycast RP

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