Shulou(Shulou.com)06/01 Report--

Experimental topology

Basic configuration:

R1

L0:1.1.1.1/32

L1:11.1.1.1/32

E1/0:10.1.12.1/24

E1/1:10.1.14.1/24

R2

L0:2.2.2.2/32

L1:22.2.2.2/32

E1/0:10.1.12.2/24

E1/1:10.1.24.2/24

R4

L0:4.4.4.4/32

L1:44.4.4.4/32

E1/0:10.1.24.4/24

E1/1:10.1.14.4/24

Configure IGP (RIP):

R1

Router rip

Version 2

Network 1.0.0.0

Network 10.0.0.0

No auto-summary

R2

Router rip

Version 2

Network 2.0.0.0

Network 10.0.0.0

No auto-summary

R4

Router rip

Version 2

Network 4.0.0.0

Network 10.0.0.0

No auto-summary

Configure BGP:

Router bgp 1

Bgp router-id 1.1.1.1

Bgp log-neighbor-changes

Network 1.1.1.1 mask 255.255.255.255

Network 2.2.2.2 mask 255.255.255.255 backdoor

Network 4.4.4.4 mask 255.255.255.255 backdoor

Network 11.1.1.1 mask 255.255.255.255

Neighbor 2.2.2.2 remote-as 23

Neighbor 2.2.2.2 ebgp-multihop 2

Neighbor 2.2.2.2 update-source Loopback0

Neighbor 4.4.4.4 remote-as 23

Neighbor 4.4.4.4 ebgp-multihop 2

Neighbor 4.4.4.4 update-source Loopback0

R2

Router bgp 23

Bgp router-id 2.2.2.2

Bgp log-neighbor-changes

Network 1.1.1.1 mask 255.255.255.255 backdoor

Network 2.2.2.2 mask 255.255.255.255

Network 22.2.2.2 mask 255.255.255.255

Neighbor 1.1.1.1 remote-as 1

Neighbor 1.1.1.1 ebgp-multihop 2

Neighbor 1.1.1.1 update-source Loopback0

Neighbor 4.4.4.4 remote-as 23

Neighbor 4.4.4.4 update-source Loopback0

R4

Router bgp 23

Bgp router-id 4.4.4.4

Bgp log-neighbor-changes

Network 1.1.1.1 mask 255.255.255.255 backdoor

Network 4.4.4.4 mask 255.255.255.255

Network 44.4.4.4 mask 255.255.255.255

Neighbor 1.1.1.1 remote-as 1

Neighbor 1.1.1.1 ebgp-multihop 2

Neighbor 1.1.1.1 update-source Loopback0

Neighbor 2.2.2.2 remote-as 23

Neighbor 2.2.2.2 update-source Loopback0

View the routing table of R1: origin is I, which indicates the route learned from IGP.

R1#sh ip bgp

BGP table version is 5, local router ID is 1.1.1.1

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

R RIB-failure, S Stale, m multipath, b backup-path, f RT-Filter

X best-external, an additional-path, c RIB-compressed

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

RPKI validation codes: V valid, I invalid, N Not found

Network Next Hop Metric LocPrf Weight Path

R 2.2.2.2/32 4.4.4.4 0 23 i

R > 2.2.2.2 0 023 I

R 4.4.4.4/32 4.4.4.4 0 0 23 i

R > 2.2.2.2 0 23 I

* 22.2.2.2 Universe 32 4.4.4.4 0 23 I

* > 2.2.2.2 00 23 I

* 44.4.4.4Compact 32 4.4.4.4 0 0 23 I

* > 2.2.2.2 0 23 I

View the routing table of 22.2.2.2 44.4.4.4:

R1#sh ip bgp 22.2.2.2

BGP routing table entry for 22.2.2.2/32, version 4

Paths: (2 available, best # 2, table default)

Advertised to update-groups:

eighteen

Refresh Epoch 1

twenty-three

4.4.4.4 (metric 1) from 4.4.4.4 (4.4.4.4)

Origin IGP, localpref 100, valid, external

Rx pathid: 0, tx pathid: 0

Refresh Epoch 1

twenty-three

2.2.2.2 (metric 1) from 2.2.2.2 (2.2.2.2)

Origin IGP, metric 0, localpref 100, valid, external, best

Rx pathid: 0, tx pathid: 0x0

R1#sh ip bgp 44.4.4.4

BGP routing table entry for 44.4.4.4/32, version 5

Paths: (2 available, best # 2, table default)

Advertised to update-groups:

eighteen

Refresh Epoch 1

twenty-three

4.4.4.4 (metric 1) from 4.4.4.4 (4.4.4.4)

Origin IGP, metric 0, localpref 100, valid, external

Rx pathid: 0, tx pathid: 0

Refresh Epoch 1

twenty-three

2.2.2.2 (metric 1) from 2.2.2.2 (2.2.2.2)

Origin IGP, localpref 100, valid, external, best

Rx pathid: 0, tx pathid: 0x0

Origin is all IGP. Modify the bgp origin-clde property to make the 22.2.2.2 of R1 to R2 go permanently from R4 to 44.4.4.4 of R4.

Configure on R1:

Step 1: configure prefix-list

Ip prefix-list 22 seq 5 permit 22.2.2.2/32

Ip prefix-list 44 seq 5 permit 44.4.4.4/32

Step 2: configure route-map

Route-map ori-r2 permit 10

Match ip address prefix-list 22

Set origin incomplete

Route-map ori-r2 permit 20

Route-map ori-r4 permit 10

Match ip address prefix-list 44

Set origin incomplete

Route-map ori-r4 permit 20

Step 3: in BGP, call route-map in the corresponding neighbor in direction.

Neighbor 2.2.2.2 route-map ori-r2 in

Neighbor 4.4.4.4 route-map ori-r4 in

Step 4: reset BGP neighbors and relearn routing

Clea ip bgp *

View the R1 BGP routing table:

R1#sh ip bgp

BGP table version is 16, local router ID is 1.1.1.1

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

R RIB-failure, S Stale, m multipath, b backup-path, f RT-Filter

X best-external, an additional-path, c RIB-compressed

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

RPKI validation codes: V valid, I invalid, N Not found

Network Next Hop Metric LocPrf Weight Path

* > 1.1.1.1 Compact 32 0.0.0.0 0 32768 I

R 2.2.2.2/32 4.4.4.4 0 23 i

R > 2.2.2.2 0 023 I

R 4.4.4.4/32 4.4.4.4 0 0 23 i

R > 2.2.2.2 0 23 I

* > 11.1.1.1 Compact 32 0.0.0.0 0 32768 I

* > 22.2.2.2Compact 32 4.4.4.4 0 23 I

* 2.2.2.2 0 023?

* 44.4.4.4Compact 32 4.4.4.4 0 023?

* > 2.2.2.2 0 23 I

This is, the BGP table shows the 22.2.2.2 routes learned from R2, and the origin-code attribute has been changed to? (incomplete), the 44.4.4.4 route learned from R4, the attribute is also changed to? (incomplete), give priority to routes with an origin-clde of I.

IGP (I) is better than EGP (e) and incomplete (?) The route of the.

R1#sh ip bgp 22.2.2.2

BGP routing table entry for 22.2.2.2/32, version 16

Paths: (2 available, best # 1, table default)

Advertised to update-groups:

eighteen

Refresh Epoch 1

twenty-three

4.4.4.4 (metric 1) from 4.4.4.4 (4.4.4.4)

Origin IGP, localpref 100, valid, external, best

Rx pathid: 0, tx pathid: 0x0

Refresh Epoch 1

twenty-three

2.2.2.2 (metric 1) from 2.2.2.2 (2.2.2.2)

Origin incomplete, metric 0, localpref 100, valid, external

Rx pathid: 0, tx pathid: 0

R1#sh ip bgp 44.4.4.4

BGP routing table entry for 44.4.4.4/32, version 15

Paths: (2 available, best # 2, table default)

Advertised to update-groups:

eighteen

Refresh Epoch 1

twenty-three

4.4.4.4 (metric 1) from 4.4.4.4 (4.4.4.4)

Origin incomplete, metric 0, localpref 100, valid, external

Rx pathid: 0, tx pathid: 0

Refresh Epoch 1

twenty-three

2.2.2.2 (metric 1) from 2.2.2.2 (2.2.2.2)

Origin IGP, localpref 100, valid, external, best

Rx pathid: 0, tx pathid: 0x0

The experiment is complete.

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