Hi Guys,
I need some assistance with a problem re BGP on my international gateway
routers. What is happening is that I am advertising on both routers a
summary address and specific addresses to provide load sharing of traffic
between the two links. The problem is with the 202.4.48.0/22 address which
is advertised over the router connected to Newskies. It is showing the the
next hop as the router 202.4.32.242 but not as 0.0.0.0. I have announced
the specific route but can anyone can help me if out why the bgp table is
showing is below.
*> 202.4.48.0/22 202.4.32.242 100 32768 i
GP table version is 21093, local router ID is 192.168.100.2
Status codes: s suppressed, d damped, h history, * valid, > best, i -
internal
Origin codes: i - IGP, e - EGP, ? - incomplete
Network Next Hop Metric LocPrf Weight Path
* 61.88.170.100/30 210.5.248.249 0 0 23649 i
* 63.100.216.0/21 210.5.248.249 0 0 23649 i
* 202.0.50.0 210.5.248.249 1 0 23649 i
* 202.1.164.0 210.5.248.249 1 0 23649 i
* 202.2.96.0/22 210.5.248.249 1 0 23649 i
*> 202.4.32.0/21 0.0.0.0 0 32768 i
*> 202.4.32.0/19 0.0.0.0 32768 i
* i 192.168.100.1 100 0 i
*> 202.4.48.0/22 202.4.32.242 100 32768 i
* 210.5.248.0/21 210.5.248.249 0 0 23649 i
LAV-Newskies#sh ip bgp summary
BGP router identifier 192.168.100.2, local AS number 17993
BGP table version is 21141, main routing table version 21141
9 network entries and 10 paths using 1273 bytes of memory
6 BGP path attribute entries using 720 bytes of memory
5 BGP AS-PATH entries using 168 bytes of memory
0 BGP route-map cache entries using 0 bytes of memory
8 BGP filter-list cache entries using 96 bytes of memory
BGP activity 13/346 prefixes, 19/9 paths, scan interval 15 secs
Neighbor V AS MsgRcvd MsgSent TblVer InQ OutQ Up/Down
State/PfxRcd
192.168.100.1 4 17993 3519 3520 21141 0 0 2d10h 1
210.5.248.249 4 23649 137634 3526 21141 0 0 2d10h 6
LAV-Newskies#sh ip bgp neighbors 210.5.248.249 advertised-routes
BGP table version is 21147, local router ID is 192.168.100.2
Status codes: s suppressed, d damped, h history, * valid, > best, i -
internal
Origin codes: i - IGP, e - EGP, ? - incomplete
Network Next Hop Metric LocPrf Weight Path
*> 202.4.32.0/21 0.0.0.0 0 32768 i
*> 202.4.32.0/19 0.0.0.0 32768 i
*> 202.4.48.0/22 202.4.32.242 100 32768 i
LAV-Newskies#sh ip route ospf
202.4.36.0/24 is variably subnetted, 2 subnets, 2 masks
O E2 202.4.36.0/30 [110/1000] via 202.4.32.241, 2d09h, FastEthernet0/0
O 202.4.36.0/24 [110/2] via 202.4.32.241, 2d09h, FastEthernet0/0
202.4.32.0/24 is variably subnetted, 4 subnets, 3 masks
O E2 202.4.32.144/28 [110/100] via 202.4.32.250, 01:31:00,
FastEthernet0/0
O 202.4.32.8/30 [110/391] via 202.4.32.241, 2d09h, FastEthernet0/0
O 202.4.32.4/30 [110/51] via 202.4.32.241, 2d09h, FastEthernet0/0
O E2 202.4.34.0/24 [110/1000] via 202.4.32.241, 2d09h, FastEthernet0/0
192.168.100.0/32 is subnetted, 4 subnets
O E2 192.168.100.8 [110/100] via 202.4.32.249, 2d09h, FastEthernet0/0
O E2 192.168.100.3 [110/100] via 202.4.32.250, 2d09h, FastEthernet0/0
O E2 202.4.52.0/23 [110/1000] via 202.4.32.241, 2d09h, FastEthernet0/0
O E2 202.4.48.0/22 [110/100] via 202.4.32.242, 2d09h, FastEthernet0/0
O E2 202.4.40.0/23 [110/100] via 202.4.32.241, 2d09h, FastEthernet0/0
Router Configuration from LAV-Newskies
======================================
router ospf 1
log-adjacency-changes
network 202.4.32.253 0.0.0.0 area 0
default-information originate metric 1000 route-map DEFAULT_ONLY
!
router bgp 17993
no synchronization
bgp log-neighbor-changes
network 202.4.32.0 mask 255.255.248.0
network 202.4.48.0 mask 255.255.252.0
aggregate-address 202.4.32.0 255.255.224.0
neighbor ebgp-newskies peer-group
neighbor ebgp-newskies remote-as 23649
neighbor ebgp-newskies description Ebgp Peer with Newskies
neighbor ebgp-newskies version 4
neighbor ebgp-newskies send-community
neighbor ebgp-newskies remove-private-AS
neighbor ebgp-newskies prefix-list announce out
neighbor ebgp-newskies filter-list 20 in
neighbor internal peer-group
neighbor internal remote-as 17993
neighbor internal description ibgp peers
neighbor internal update-source Loopback100
neighbor internal next-hop-self
neighbor internal send-community
neighbor internal prefix-list Sclout out
neighbor 192.168.100.1 peer-group internal
neighbor 210.5.248.249 peer-group ebgp-newskies
neighbor 210.5.248.249 ebgp-multihop 255
neighbor 210.5.248.250 peer-group ebgp-newskies
neighbor 210.5.248.250 ebgp-multihop 255
no auto-summary
!
no ip http server
ip classless
ip route 0.0.0.0 0.0.0.0 63.100.218.29
ip route 63.100.220.253 255.255.255.255 63.100.218.29
ip route 63.100.220.254 255.255.255.255 63.100.218.29
ip route 172.16.1.0 255.255.255.0 63.100.216.89
ip route 192.168.100.1 255.255.255.255 202.4.32.252
ip route 202.4.32.0 255.255.248.0 Null0 200
ip route 202.4.48.0 255.255.252.0 Null0 200
ip flow-export destination 202.4.32.136 9876
ip flow-export destination 202.4.32.135 9876
ip as-path access-list 20 permit ^[0-9]*$
ip pim bidir-enable
ip prefix-list Sclout seq 5 permit 202.4.32.0/19
!
ip prefix-list announce seq 5 permit 202.4.32.0/19 le 32
logging 202.4.32.132
access-list 5 permit 0.0.0.0
access-list 6 permit 210.5.248.249
route-map DEFAULT_ONLY permit 10
match ip address 5
match ip next-hop 6
