3com 8807 사용자 가이드
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MSDP Overview
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Message forwarding and RPF check between MSDP peers
As shown in Figure 115 “MSDP working principles (II)”, Switch A, Switch B, Switch
C, Switch D, Switch E and Switch F belong to domain 1, domain 2 and domain 3
respectively. MSDP peer relationship is established between them, indicated with
bi-directional arrows in the figure. Among them, Mesh Group is created among
Switch B, Switch C and Switch D.
C, Switch D, Switch E and Switch F belong to domain 1, domain 2 and domain 3
respectively. MSDP peer relationship is established between them, indicated with
bi-directional arrows in the figure. Among them, Mesh Group is created among
Switch B, Switch C and Switch D.
Figure 115 MSDP working principles (II)
The SA message forwarding and RPF check among these MSDP peers are
illustrated as follows:
illustrated as follows:
If the SA message is from a MSDP peer that is the RP of the multicast source as
from Switch A to Switch B, it is received and forwarded to other peers.
from Switch A to Switch B, it is received and forwarded to other peers.
If the SA message is from a MSDP peer that has only one peer as from Switch B to
Switch A, it is received.
Switch A, it is received.
If the SA message is from a static RPF peer as from Switch D to Switch E, it is
received and forwarded to other peers.
received and forwarded to other peers.
If the SA message is from a MSDP peer in Mesh Group as from Switch B to Switch
D, it is received and forwarded to the peers outside the Mesh Group.
D, it is received and forwarded to the peers outside the Mesh Group.
If the SA message is sent from a MSDP peer in a same domain, and the peer is the
next hop along the optimal path to the RP in the domain of source, as in the case
when the message is from Switch E to Switch F, it is received and forwarded to
other peers.
next hop along the optimal path to the RP in the domain of source, as in the case
when the message is from Switch E to Switch F, it is received and forwarded to
other peers.
AS 1
AS 2
AS 3
SwitchD
SwitchF
SwitchE
SwitchC
SwitchB
SwitchA
Source
mesh group
Static peer