*> 200.1.3.0 200.1.3.1 0 0 20?
*> 200.1.4.0 200.1.3.1 0 20 10?
Check the routing table of Switch C. You can find that Switch C learns the advertised by Switch
B.
<SwitchC> display bgp routing-table
BGP Local router ID is 3.3.3.3
Status codes: * - valid, > - best, d - damped,
h - history, i - internal, s - suppressed, S - Stale
Origin : i - IGP, e - EGP, ? - incomplete
Total Number of Routes: 8
Network NextHop MED LocPrf PrefVal Path/Ogn
*> 200.1.2.0 200.1.4.1 0 0 10?
* 200.1.3.1 0 0 20?
*> 200.1.3.0 0.0.0.0 0 0 ?
* 200.1.4.1 0 10 20?
200.1.3.1 0 0 20?
*> 200.1.3.2/32 0.0.0.0 0 0 ?
*> 200.1.4.0 0.0.0.0 0 0 ?
* 200.1.3.1 0 20 10?
200.1.4.1 0 0 10?
*> 200.1.4.2/32 0.0.0.0 0 0 ?
Step 4 Configure the AS-Path filter on Switch B and apply the filter on the outbound interface of Switch
B.
# Create AS-Path filter 1, denying the passing of routes carrying AS 30. The regular expression
"_30_" indicates any AS list that contains AS 30 and ".*" matches any character.
[SwitchB] ip as-path-filter 1 deny _30_
[SwitchB] ip as-path-filter 1 permit .*
# Create AS-Path filter 2, denying the passing of routes carrying AS 10.
[SwitchB] ip as-path-filter 2 deny _10_
[SwitchB] ip as-path-filter 2 permit .*
# Apply the AS-Path filter on two outbound interfaces of Switch B.
[SwitchB] bgp 20
[SwitchB-bgp] peer 200.1.2.1 as-path-filter 1 export
[SwitchB-bgp] peer 200.1.3.2 as-path-filter 2 export
[SwitchB-bgp] quit
Step 5 Check the routing table advertised by Switch B, and you can find that the advertised routes to
the network segment between Switch A and Switch C do not exist. Take the route advertised by
Switch B to Switch C as an example.
<SwitchB> display bgp routing-table peer 200.1.3.2 advertised-routes
BGP Local router ID is 2.2.2.2
Status codes: * - valid, > - best, d - damped,
h - history, i - internal, s - suppressed, S - Stale
Origin : i - IGP, e - EGP, ? - incomplete
Total Number of Routes: 3
Network NextHop MED LocPrf PrefVal Path/Ogn
*> 200.1.2.0 200.1.3.1 0 0 20?
*> 200.1.3.0 200.1.3.1 0 0 20?
*> 200.1.4.0 200.1.3.1 0 20 10?
Similarly, the BGP routing table of Switch C does not have the two routes.
<SwitchC> display bgp routing-table
S6700 Series Ethernet Switches
Configuration Guide - IP Routing 7 BGP Configuration
Issue 01 (2012-03-15) Huawei Proprietary and Confidential
Copyright © Huawei Technologies Co., Ltd.
452
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