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3Com Switch 7750 Configuration Guide Guide

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MSDP Configuration Example 451
You can locate message loss and configuration errors by tracing the network path
of the specified (S, G, RP) entries. Once the transmission path of SA messages is
determined, correct configuration can prevent the flooding of SA messages.
MSDP Configuration
Example
Configuration Example
of MSDP Based on BGP
Routes
Network requirements
Two ISPs maintains their ASs, AS 100 and AS 200 respectively. OSPF is running
within each AS, and BGP is running between the two ASs. PIM-SM1 belongs to AS
100, while PIM-SM2 and PIM-SM3 belong to AS 200.
Suppose each PIM-SM domain is a single-BSR-managed domain, having 0 or 1
multicast source S and multiple receivers. OSPF runs within each domain to
provide unicast routes. An MSDP peering relationship is established between the
RPs based on BGP routes within each PIM-SM network.
Loopback 0 on Switch C, Switch D and Switch E functions as the C-BSR and C-RP
of its own SM domain respectively. An MSDP peering relationship is established
between Switch C and Switch F based on EBGP routes, and an MSDP peering
relationship is established between Switch F and Switch D based on IBGP routes.
Network diagram
Figure 109 Network diagram for MSDP configuration
Table 359 Trace the transmission path of an SA message over the network
Operation Command
Trace the transmission path of an SA message
over the network
msdp-tracert source-address group-address
rp-address [ max-hops max-hops ] [
next-hop-info | sa-info | peer-info ]* [
skip-hops skip-hops ]
Vlan- i nterf ac e 110
Switch C
PIM- SM1
Switch D
Loopback 0
1.1.1.1/32
Loopback 0
PIM- SM2
AS 100
AS 200
PIM- SM3
Switch F
Loopback 0
3.3.3.3/32
Vlan- interface 200
S1
S3
MSDP
peer
MSDP
peer
Switch B
Switch G
Switch A
users
users
users
Switch E
10.110.1.1/ 8
10. 110.2.1/8
192.168.1.1/ 24
Vlan- interface 120
Vlan- i nterf ac e 100
192.168.3.2/ 24
Vlan- interface 101
10.110.4.1/8
Vlan- interface 100
192.168.1.2/ 24
Vlan- interface 101
192. 168.3.1/24
Vlan- i nterf ac e 100
10. 110.3.1/8
2.2.2.2/32
p