Information Technology Reference
In-Depth Information
Figure 7-24 Prefix Propagation in Steps 7 and 8
R8
R1
R8
R1
RR
RR
RR
NEXT_HOP:
R2
NEXT_HOP:
R2
NEXT_HOP:
R2
Withdraw
R2
R3
R4
R2
R3
R4
Client
Client
Client
Client
Client
Client
Step 7
Step 8
The current BGP RIB on R8 is shown in Table 7-18. Next, R8 updates
R4 with the new path, as shown in Figure 7-24.
Step 8
Table 7-18 BGP Paths on R8
Path
BGP Next Hop
AS_PATH
MED
IGP Metric
1 *
R2
200 400
10
20
With the new update from R8, the BGP RIB on R4 is shown in Table 7-19.
The best path is Path 2 because it is an external route. Next, R4 sends the
update to R8, as shown in Figure 7-25.
Step 9
Table 7-19 BGP Paths on R4
Path
BGP Next Hop
AS_PATH
MED
IGP Metric
1
R2
200 400
10
26
2 *
R6
300 400
6
10
 
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