Information Technology Reference
In-Depth Information
In Example 11-10, the BGP path information for the originating RP, 10.1.0.1, indicates that
the best path was received from 10.1.0.4, or R4. According to the rules for RPF using an
i(m)BGP peer, the source of the MSDP session needs to be 10.1.0.4, which it is, as
indicated by the MSDP debugs shown in Example 11-9.
Example 11-10 mBGP Best Path Selection for the Originating RP
R5#show ip mbgp 10.1.0.1
BGP routing table entry for 10.1.0.1/32, version 4
Paths: (1 available, best #1, table Default-MBGP-Routing-Table)
Not advertised to any peer
2 3
10.2.1.1 (metric 128) from 10.1.0.4 (10.1.0.4)
Origin IGP, localpref 100, valid, internal, best
Figure 11-20 shows an RPF check that fails.
Figure 11-20 Failed iBGP-Based MSDP SA RPF
Source
ISP 3
ISP 2
R1
R2
BGP Peer
MSDP Peer
SA Message
R3
R4
ISP 1
R5
 
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