Step 10 - path are external ( 13 step selection route BGP)

10- The paths are external ( chỉ xét đối với eBGP)

        => Prefer with a path was received first.

Note:

- DON'T Modify => Paths learn by eBGP, will always break at Step 10 ( cannot go to step 10,11,12)

- Modify => go to step 11 (command : " bgp bestpath compare-router-id" => when using ? )

Note:

- Using command : " clear ip bgp * soft" when you configure " bgp bestpath... "

- If RouterID is same => go to step 12 or 13

R2#show run | se router bgp

router bgp 2

 neighbor 10.1.12.1 remote-as 1

 neighbor 10.1.23.3 remote-as 3

 no auto-summary

R2#show ip bgp

BGP table version is 6, local router ID is 2.2.2.2

Status codes: s suppressed, d damped, h history, * valid, > best, i - internal,

              r RIB-failure, S Stale

Origin codes: i - IGP, e - EGP, ? - incomplete

   Network          Next Hop            Metric LocPrf Weight Path

*> 8.8.8.0/24       10.1.12.1                0             0 1 i

*                             10.1.23.3                0             0 3 i

Nhận xét: R2 học mạng 8.8.8.0/24 qua R1 vì nhận được update từ R1 sớm hơn R3.

Xét từng bước:

1. Weight: bằng nhau 0

2. Local prefer: bằng nhau 100

3. Perfer the path was locally..: bằng nhau
4. AS-path: bằng nhau
5. Origin type : bằng nhau
6. Med: bằng nhau
7. Prefer eBGP over iBGP: cùng eBGP
8. Prefer with lowes IGP metric to BGP next-hop : bằng nhau

9. Không xét ở đây.

10. The path are external: BREAK