Dear All
Good morning everyone!
Need your assistant to solve this problem as below:
Description: There are four AS in this diagram. Assume that we’re in AS30. AS40 and AS50 are our upstream and AS10 is our downstream. There are two routers in AS10 using iBGP. And each router in that AS10 is connected to R3 at AS30.
In R3 currentlly, all traffic destinate to R1 will be via R1, and all destination to R2 wil be via R2.
Origin codes: i - IGP, e - EGP, ? - incomplete
Network Next Hop Metric LocPrf Weight Path
*> 1.1.1.0/24 192.168.31.1 0 0 10 i
* 192.168.32.2 2 0 10 i
*> 1.1.2.0/24 192.168.31.1 0 0 10 i
* 192.168.32.2 2 0 10 i
*> 1.1.3.0/24 192.168.31.1 0 0 10 i
* 192.168.32.2 2 0 10 i
* 2.2.1.0/24 192.168.31.1 2 0 10 i
*> 192.168.32.2 0 0 10 i
* 2.2.2.0/24 192.168.31.1 2 0 10 i
*> 192.168.32.2 0 0 10 i
*> 4.4.4.4/32 192.168.34.4 0 0 40 i
*> 5.5.5.5/32 192.168.35.5 0 0 50 i
- Trace result from R4
R4#traceroute 1.1.1.1 source 4.4.4.4
Type escape sequence to abort.
Tracing the route to 1.1.1.1
1 192.168.34.3 100 msec 12 msec 92 msec
2 192.168.31.1 96 msec 132 msec 88 msec
R4#traceroute 2.2.2.2 source 4.4.4.4
Type escape sequence to abort.
Tracing the route to 2.2.2.2
1 192.168.34.3 96 msec 56 msec 72 msec
2 192.168.32.2 128 msec 48 msec 92 msec
- Trace result from R5
R5#traceroute 2.2.2.2 source 5.5.5.5
Type escape sequence to abort.
Tracing the route to 2.2.2.2
1 192.168.35.3 104 msec 96 msec 80 msec
2 192.168.32.2 92 msec 76 msec 64 msec
R5#traceroute 1.1.1.1 source 5.5.5.5
Type escape sequence to abort.
Tracing the route to 1.1.1.1
1 192.168.35.3 96 msec 88 msec 164 msec
2 192.168.31.1 112 msec 88 msec 32 msec
Objective:
- All INBOUND traffic of AS40 destinate to AS10 must go through R2 which is primary link
- All INBOUND traffic of AS50 destinate to AS10 must go through R1 which is backup link
I've used route-map to set next hob IP to match my objectives and the result is fine.
I would like to ask if there is another method besides this policy based routing to archive it.
Your comment would be much appreciated.
