Hi group,
RotuerC ----------------- RouterA ---------------- RouterB
On p9 of BGP 4 Command & Configuration Handbook (by Parkhurst), I follow the
exercise on Aggregating the BGP Learning Routes, everything seems well
except I can't ping from Router C to any of the 4 Loopback Interfaces I
created on Router B, even though I can see the routes fine on both Router
C's BGP table and Routing Table:
RouterC>sh ip bgp
BGP table version is 6, local router ID is 172.17.1.2
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
*> 172.16.0.0/24 172.17.1.1 0 1 2 i
*> 172.16.0.0/22 172.17.1.1 0 1 i
*> 172.16.1.0/24 172.17.1.1 0 1 2 i
*> 172.16.2.0/24 172.17.1.1 0 1 2 i
*> 172.16.3.0/24 172.17.1.1 0 1 2 i
RouterC>
RouterC>sh ip route
Codes: C - connected, S - static, I - IGRP, R - RIP, M - mobile, B - BGP
D - EIGRP, EX - EIGRP external, O - OSPF, IA - OSPF inter area
E1 - OSPF external type 1, E2 - OSPF external type 2, E - EGP
i - IS-IS, L1 - IS-IS level-1, L2 - IS-IS level-2, * - candidate
default
U - per-user static route
Gateway of last resort is not set
172.16.0.0/16 is variably subnetted, 5 subnets, 2 masks
B 172.16.0.0/22 [20/0] via 172.17.1.1, 00:00:55
B 172.16.0.0/24 [20/0] via 172.17.1.1, 02:19:56
B 172.16.1.0/24 [20/0] via 172.17.1.1, 02:19:56
B 172.16.2.0/24 [20/0] via 172.17.1.1, 02:19:56
B 172.16.3.0/24 [20/0] via 172.17.1.1, 02:19:56
172.17.0.0/24 is subnetted, 1 subnets
C 172.17.1.0 is directly connected, Serial0
RouterC>
When I tried to do a trace to say 172.16.0.1 (which is one of the loopback
interface created on Router B), the packets was stuck on Router A
RouterC>trace 172.16.0.1
Type escape sequence to abort.
Tracing the route to 172.16.0.1
1 RouterA (172.17.1.1) 16 msec 16 msec 20 msec
2 * * *
3
However, on Router A, I can ping fine to all 4 loopback interfaces
advertised by Router B:-
RouterA#ping 172.16.0.1
Type escape sequence to abort.
Sending 5, 100-byte ICMP Echos to 172.16.0.1, timeout is 2 seconds:
!!!!!
Success rate is 100 percent (5/5), round-trip min/avg/max = 32/32/32 ms
RouterA#ping 172.16.1.1
Type escape sequence to abort.
Sending 5, 100-byte ICMP Echos to 172.16.1.1, timeout is 2 seconds:
!!!!!
Success rate is 100 percent (5/5), round-trip min/avg/max = 32/32/32 ms
RouterA#ping 172.16.2.1
Type escape sequence to abort.
Sending 5, 100-byte ICMP Echos to 172.16.2.1, timeout is 2 seconds:
!!!!!
Success rate is 100 percent (5/5), round-trip min/avg/max = 28/54/148 ms
RouterA#
So if Router A can get to the Loopback interfaces advertised by Router B,
and Router C have got the routes in the Routing Table, why can't Router C
trace or ping to Router B's Loopback interfaces??
Please find attached a copy of the configs for the 3 routers:-
RouterC#sh run
Building configuration...
Current configuration:
!
version 11.1
service timestamps debug datetime msec show-timezone
service timestamps log datetime msec show-timezone
service udp-small-servers
service tcp-small-servers
!
hostname RouterC
!
enable secret 5 $1$R1vV$Ld5F0ueggoSyb4z/goBGF.
!
!
interface Ethernet0
no ip address
!
interface Serial0
ip address 172.17.1.2 255.255.255.0
!
interface Serial1
no ip address
!
router bgp 65530
neighbor 172.17.1.1 remote-as 1
!
ip host RouterA 172.17.1.1
ip classless
logging buffered
!
line con 0
line aux 0
line vty 0 4
password cisco
login
!
end
RouterC#
----------------------------------------------------------------------------
---------------------------------------------------------
RouterA#sh run
Building configuration...
Current configuration : 907 bytes
!
version 12.2
no service single-slot-reload-enable
service timestamps debug uptime
service timestamps log uptime
no service password-encryption
!
hostname RouterA
!
logging rate-limit console 10 except errors
enable secret 5 $1$hCDv$aQ/xa.CZ7YloCaNRpAaI90
!
ip subnet-zero
no ip finger
no ip domain-lookup
ip host RouterC 172.17.1.2
ip host RouterB 10.1.1.2
!
no ip dhcp-client network-discovery
!
!
!
!
interface Ethernet0
no ip address
!
interface Serial0
ip address 172.17.1.1 255.255.255.0
clockrate 64000
!
interface Serial1
ip address 10.1.1.1 255.255.255.252
clockrate 64000
!
router bgp 1
bgp log-neighbor-changes
aggregate-address 172.16.0.0 255.255.252.0
neighbor 10.1.1.2 remote-as 2
neighbor 172.17.1.2 remote-as 65530
!
ip kerberos source-interface any
ip classless
ip http server
!
!
!
line con 0
transport input none
line 1 16
line aux 0
line vty 0 4
password cisco
login
!
end
RouterA#
----------------------------------------------------------------------------
---------------------------------------------------------------
RouterB#sh run
Building configuration...
Current configuration:
!
version 12.0
service timestamps debug uptime
service timestamps log uptime
no service password-encryption
!
hostname RouterB
!
enable secret 5 $1$zNVg$hD/CjofG0d4SosB6/7.1I1
!
ip subnet-zero
no ip domain-lookup
ip host RouterA 10.1.1.1
!
!
!
interface Loopback0
ip address 172.16.0.1 255.255.255.0
ip directed-broadcast
!
interface Loopback1
ip address 172.16.1.1 255.255.255.0
ip directed-broadcast
!
interface Loopback2
ip address 172.16.2.1 255.255.255.0
ip directed-broadcast
!
interface Loopback3
ip address 172.16.3.1 255.255.255.0
ip directed-broadcast
!
interface Ethernet0
no ip address
no ip directed-broadcast
!
interface Serial0
ip address 10.1.1.2 255.255.255.252
ip directed-broadcast
!
interface Serial1
no ip address
no ip directed-broadcast
!
interface BRI0
no ip address
no ip directed-broadcast
!
router bgp 2
network 172.16.0.0 mask 255.255.255.0
network 172.16.1.0 mask 255.255.255.0
network 172.16.2.0 mask 255.255.255.0
network 172.16.3.0 mask 255.255.255.0
neighbor 10.1.1.1 remote-as 1
no auto-summary
!
ip classless
!
!
line con 0
transport input none
line aux 0
line vty 0 4
password cisco
login
!
end
RouterB#
Thanks in advance,
Hunt
Message Posted at:
http://www.groupstudy.com/form/read.php?f=7&i=46131&t=46131
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