BGP Design and Implementation by Zhang Randy & Bartell Micah

Author:Zhang, Randy & Bartell, Micah [Zhang, Randy]
Language: eng
Format: mobi
Publisher: Cisco Press
Published: 2003-12-11T16:00:00+00:00

Figure 7-12 shows an example of the need to maintain congruence between the two topologies. Both R1 and R2 are RRs, but their iBGP session goes through a client, R4. If there is any problem in R4 or links from R1 to R2, two RRs and their clients are isolated. One solution (shown in the center topology of Figure 7-12) is to have a direct physical link between R1 and R2.

Figure 7-12 Following the Physical Topology

Another solution is to follow the physical topology, as shown in the right topology in Figure 7-12. In this solution, R4 is an RR, and both R2 and R5 are clients of R4. Note that the session between R4 and R5 does not have a physical link, but because both R2 and R5 are clients and there is no physical redundancy, no additional risk is introduced.

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