The following example shows the routes in the BGP (Border Gateway Protocol) routing table at Router A after applying the custFilter inbound policy:
* Switch.55 # show bgp route all Routes: Destination Peer Next-Hop LPref Weight MED AS-Path ----------------------------------------------------------------------------------- *>i 10.1.1.0/24 10.10.10.2 10.10.10.2 100 1 100 64505 64496 0 *>i 10.1.2.0/24 10.10.10.2 10.10.10.2 100 1 100 64505 64496 0 *>i 10.1.3.0/24 10.10.10.2 10.10.10.2 100 1 100 64505 64496 0 *>i 10.1.34.0/24 10.10.10.2 10.10.10.2 100 1 100 64505 64499 Flags: (*) Preferred BGP route, (>) Active, (d) Suppressed, (h) History (s) Stale, (m) Multipath, (u) Unfeasible Origin: (?) Incomplete, (e) EGP, (i) IGP BGP Route Statistics Total Rxed Routes : 5 Feasible Routes : 4 Active Routes : 4 Rejected Routes : 1 Unfeasible Routes : 0 Route Statistics on Session Type Routes from Int Peer: 0 Routes from Ext Peer: 4
Route 172.16.1.0/24 is not present in the BGP routing table shown above.
The next example shows that the MED and community values are set as defined in the policy.
* Switch.56 # show bgp route detail all Routes: Route: 10.1.1.0/24, Peer 10.10.10.2, BEST, Active Origin IGP, Next-Hop 10.10.10.2, LPref 100, MED 100 Weight 1, As-PATH: 64505 64496 0 Community: 2342:6788 Route: 10.1.2.0/24, Peer 10.10.10.2, BEST, Active Origin IGP, Next-Hop 10.10.10.2, LPref 100, MED 100 Weight 1, As-PATH: 64505 64496 0 Community: 2342:6788 Route: 10.1.3.0/24, Peer 10.10.10.2, BEST, Active Origin IGP, Next-Hop 10.10.10.2, LPref 100, MED 100 Weight 1, As-PATH: 64505 64496 0 Community: 2342:6788 Route: 10.1.34.0/24, Peer 10.10.10.2, BEST, Active Origin IGP, Next-Hop 10.10.10.2, LPref 100, MED 100 Weight 1, As-PATH: 64505 64499 Community: 2342:6788 BGP Route Statistics Total Rxed Routes : 5 Feasible Routes : 4 Active Routes : 4 Rejected Routes : 1 Unfeasible Routes : 0 Route Statistics on Session Type Routes from Int Peer: 0 Routes from Ext Peer: 4
View the routes that are denied at Router A.
* Switch.57 # show bgp neighbor 10.10.10.2 rejected-routes all Rejected Routes: Destination Peer Next-Hop LPref Weight MED AS-Path --------------------------------------------------------------------------------- i 172.16.1.0/24 10.10.10.2 10.10.10.2 0 1 0 64505 Flags: (*) Preferred BGP route, (>) Active, (d) Suppressed, (h) History (s) Stale, (m) Multipath, (u) Unfeasible Origin: (?) Incomplete, (e) EGP, (i) IGP BGP Route Statistics Total Rxed Routes : 5 Rejected Routes : 1 Unfeasible Routes : 0
The next command example shows the denied route as an inactive route.
The routes were updated because soft-reset is configured for this neighbor.
* Switch.61 # show bgp neighbor 10.10.10.2 received-routes all Routes: Destination Peer Next-Hop LPref Weight MED AS-Path Destination Peer Next-Hop LPref Weight MED AS-Path --------------------------------------------------------------------------------- i 172.16.1.0/24 10.10.10.2 10.10.10.2 0 1 0 64505 *>i 10.1.1.0/24 10.10.10.2 10.10.10.2 100 1 100 64505 64496 0 *>i 10.1.2.0/24 10.10.10.2 10.10.10.2 100 1 100 64505 64496 0 *>i 10.1.3.0/24 10.10.10.2 10.10.10.2 100 1 100 64505 64496 0 *>i 10.1.34.0/24 10.10.10.2 10.10.10.2 100 1 100 64505 64499 Flags: (*) Preferred BGP route, (>) Active, (d) Suppressed, (h) History (s) Stale, (m) Multipath, (u) Unfeasible Origin: (?) Incomplete, (e) EGP, (i) IGP BGP Route Statistics Total Rxed Routes : 5 Feasible Routes : 4 Active Routes : 4 Rejected Routes : 1 Unfeasible Routes : 0
The following command examples show that the denied routes are not transmitted to the neighbors:
* Switch.58 # show bgp neighbor 10.20.20.2 transmitted-routes all Advertised Routes: Destination Next-Hop LPref Weight MED AS-Path ----------------------------------------------------------------------------- >i 10.1.1.0/24 10.20.20.1 0 100 64500 64505 64496 0 >i 10.1.2.0/24 10.20.20.1 0 100 64500 64505 64496 0 >i 10.1.3.0/24 10.20.20.1 0 100 64500 64505 64496 0 >i 10.1.34.0/24 10.20.20.1 0 100 64500 64505 64499 Flags: (*) Preferred BGP route, (>) Active, (d) Suppressed, (h) History (s) Stale, (m) Multipath, (u) Unfeasible Origin: (?) Incomplete, (e) EGP, (i) IGP BGP Route Statistics Advertised Routes : 4 * Switch.59 # show bgp neighbor 10.20.20.2 transmitted-routes detail all Advertised Routes: Route: 10.1.1.0/24, Active Origin IGP, Next-Hop 10.20.20.1, MED 100 As-PATH: 64500 64505 64496 0 Route: 10.1.2.0/24, Active Origin IGP, Next-Hop 10.20.20.1, MED 100 As-PATH: 64500 64505 64496 0 Route: 10.1.3.0/24, Active Origin IGP, Next-Hop 10.20.20.1, MED 100 As-PATH: 64500 64505 64496 0 Route: 10.1.34.0/24, Active Origin IGP, Next-Hop 10.20.20.1, MED 100 As-PATH: 64500 64505 64499 BGP Route Statistics Advertised Routes : 4
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