[nsp] Back to basics? BGP /27 advertisement

From: William Sommers (sommers@sfo.com)
Date: Wed Mar 28 2001 - 18:39:04 EST


Okay, much as I hate to admit it, I'm officially baffled -- this should be
dirt simple. Is there perhaps some trick to advertising a prefix gt
24? IOS 12.0.16

Goal: Advertise a /27 delegated from an upstream, to that upstream.

  -wfs

interface Ethernet0
    description X-Connect to 10.1.130.85/30
    ip address 10.1.130.86 255.255.255.252

interface Ethernet1
    ip address 10.2.27.1 255.255.255.224

router bgp 65000
    no synchronization
    network 10.2.27.0 mask 255.255.255.224
    aggregate-address 10.2.27.0 255.255.255.224 summary-only
    neighbor 10.1.130.85 remote-as 65001
    neighbor 10.1.130.85 next-hop-self
    neighbor 10.1.130.85 route-map US-OUT out
    neighbor 10.1.130.85 filter-list 166 out

ip route 0.0.0.0 0.0.0.0 10.1.130.85
ip route 10.2.27.0 255.255.255.224 Null0 200

ip as-path access-list 166 permit ^$

ip prefix-list upstream_ip_out seq 10 permit 10.2.27.0/27

route-map US-OUT permit 10
    match ip address prefix-list upstream_ip_out

#sh ip rou
Gateway of last resort is 10.1.130.85 to network 0.0.0.0

        10.0.0.0/8 is variably subnetted, 2 subnets, 2 masks
C 10.2.27.0/27 is directly connected, Ethernet1
C 10.1.130.84/30 is directly connected, Ethernet0
S* 0.0.0.0/0 [1/0] via 10.1.130.85

#sh ip bgp nei 10.1.130.85
BGP neighbor is 10.1.130.85, remote AS 65001, external link
    Index 1, Offset 0, Mask 0x2
     NEXT_HOP is always this router
     BGP version 4, remote router ID 10.3.1.1
     BGP state = Established, table version = 2, up for 00:17:28
     Last read 00:00:28, hold time is 180, keepalive interval is 60 seconds
     Minimum time between advertisement runs is 30 seconds
     Received 101 messages, 0 notifications, 0 in queue
     Sent 101 messages, 0 notifications, 0 in queue
     Prefix advertised 0, suppressed 0, withdrawn 0
     ^^^^^^^^^^^^^^^^^^^
     Outbound path policy configured
     Outgoing update AS path filter list is 166
     Route map for outgoing advertisements is US-OUT
     Connections established 7; dropped 6
     Last reset 00:17:52, due to User reset
     0 accepted prefixes consume 0 bytes
     0 history paths consume 0 bytes
Connection state is ESTAB, I/O status: 1, unread input bytes: 0
Local host: 10.1.130.86, Local port: 11006
Foreign host: 10.1.130.85, Foreign port: 179



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