I have an OSPF connectivity problem. I have 3 routers as follows:
OSPF Area 203.147.188.0 OSPF Area 0
Gw1.bne2 ------------------------ Gw2.bne -------------------Gw1.bne
Gw1.bne2 is connecting to Gw2.bne with Serial 0/0:0 (203.147.255.186 /30)
Gw2.bne is connecting back to Gw1.bne2 with Serial 0/0:0 (203.147.255.185
/30)
Gw2.bne is also connected to Gw1.bne with FastEth 0/0 (202.139.236.2 /24)
Gw1.bne is connecting back to Gw2.bne with FastEth 0/1 (202.139.236.254 /24)
Now I have 5 static routes at Gw1.bne2 (the left most Router) that I want to
redistributed into OSPF.
ip route 203.147.154.0 255.255.255.128 203.147.188.65
ip route 203.147.154.128 255.255.255.248 203.147.188.68
ip route 203.147.154.136 255.255.255.248 203.147.188.69
ip route 203.147.154.144 255.255.255.252 203.147.188.66
ip route 203.147.154.148 255.255.255.252 203.147.188.67
controller E1 0/0
channel-group 0 timeslots 1-31
!
!
interface Tunnel0
description BNE2->Avior
ip address 10.255.255.2 255.255.255.252
no ip route-cache cef
tunnel source 203.147.255.186
tunnel destination 203.147.190.4
!
interface FastEthernet0/0
no ip address
ip route-cache flow
speed 100
full-duplex
!
interface FastEthernet0/0.5
encapsulation dot1Q 5
!
interface FastEthernet0/0.10
encapsulation dot1Q 10
ip address 10.15.15.254 255.255.255.0 secondary
ip address 203.147.188.254 255.255.255.0
ip access-group pfilter in
ip accounting access-violations
ip nbar protocol-discovery
!
interface FastEthernet0/0.999
encapsulation dot1Q 999
ip address 10.2.101.1 255.255.0.0
!
interface Serial0/0:0
description N7065870L to 96 Lytton Rd
ip address 203.147.255.186 255.255.255.252
ip nbar protocol-discovery
ip route-cache flow
load-interval 30
service-policy output voippol
!
router ospf 7496
log-adjacency-changes
redistribute connected
redistribute static subnets
passive-interface FastEthernet0/0.999
network 203.147.188.0 0.0.0.255 area 203.147.188.0
network 203.147.255.184 0.0.0.3 area 203.147.188.0
At Gw1.bne2, it shows the subnets are learned via "statics"
gw1.bne2#sh ip route 203.147.154.136
Routing entry for 203.147.154.136/29
Known via "static", distance 1, metric 0
Redistributing via ospf 7496
Advertised by ospf 7496 subnets
Routing Descriptor Blocks:
* 203.147.188.69
Route metric is 0, traffic share count is 1
When I goto Gw2.bne (middle router), I can see the routes in the OSPF
Topology Table (all of them are learned from 203.147.255.186 - Gw1.bne2),
but not the its routing table:-
N.B: I also tried to do a clear ip route 203.147.144.0/20, but no help.
The same route came straight back
Type-5 AS External Link States
203.147.154.0 203.147.255.186 572 0x80000002 0xAC01 0
203.147.154.128 203.147.255.186 573 0x80000002 0xA40D 0
203.147.154.136 203.147.255.186 573 0x80000002 0x6246 0
203.147.154.144 203.147.255.186 573 0x80000002 0xFF9F 0
203.147.154.148 203.147.255.186 573 0x80000002 0xE5B4 0
gw2.bne# sh ip route 203.147.154.136
Routing entry for 203.147.144.0/20, supernet
Known via "ospf 7496", distance 110, metric 3, type inter area
Last update from 202.139.236.254 on FastEthernet0/0, 00:17:48 ago
<---- 202.139.236.254 is Gw1.bne, so wrong way!!!
Routing Descriptor Blocks:
* 202.139.236.254, from 203.147.255.156, 00:17:48 ago, via FastEthernet0/0
Route metric is 3, traffic share count is 1
However, if I goto Gw1.bne (the rightmost router), it can see all 5 subnets
in the OSPF Topoloy Table and Routing Table
Type-5 AS External Link States
203.147.154.0 203.147.255.186 867 0x80000002 0xAC01 0
203.147.154.128 203.147.255.186 867 0x80000002 0xA40D 0
203.147.154.136 203.147.255.186 867 0x80000002 0x6246 0
203.147.154.144 203.147.255.186 867 0x80000002 0xFF9F 0
203.147.154.148 203.147.255.186 867 0x80000002 0xE5B4 0
gw1.bne#sh ip route 203.147.154.136
Routing entry for 203.147.154.136/29
Known via "ospf 7496", distance 110, metric 20, type extern 2, forward
metric 52
Redistributing via ospf 7496
Last update from 202.139.236.2 on FastEthernet0/1, 00:49:30 ago
<---202.139.236.2 is Gw2.bne, so right way!!!
Routing Descriptor Blocks:
* 202.139.236.2, from 203.147.255.186, 00:49:30 ago, via FastEthernet0/1
Route metric is 20, traffic share count is 1
As a result, when I do a trace from Gw1.bne (the rightmost router), it
points it to Gw2.bne, but Gw2.bne points it back - Routing Loop :(
gw1.bne#trace 203.147.154.136
Type escape sequence to abort.
Tracing the route to 203.147.154.136
1 fa0-0.gw2.bne.webcentral.com.au (202.139.236.2) 0 msec 4 msec 0 msec
2 fa0-1.gw1.bne.webcentral.com.au (202.139.236.254) 4 msec 4 msec 0 msec
3 fa0-0.gw2.bne.webcentral.com.au (202.139.236.2) 0 msec 4 msec 4 msec
4 fa0-1.gw1.bne.webcentral.com.au (202.139.236.254) 4 msec 4 msec 4 msec
5 fa0-0.gw2.bne.webcentral.com.au (202.139.236.2) 4 msec 4 msec 4 msec
6 fa0-1.gw1.bne.webcentral.com.au (202.139.236.254) 4 msec 4 msec 0 msec
7 fa0-0.gw2.bne.webcentral.com.au (202.139.236.2) 4 msec 4 msec 0 msec
8 fa0-1.gw1.bne.webcentral.com.au (202.139.236.254) 4 msec 4 msec 4 msec
9 fa0-0.gw2.bne.webcentral.com.au (202.139.236.2) 4 msec 4 msec 4 msec
10 fa0-1.gw1.bne.webcentral.com.au (202.139.236.254) 4 msec 4 msec 4 msec
11 fa0-0.gw2.bne.webcentral.com.au (202.139.236.2) 4 msec 4 msec 4 msec
12 fa0-1.gw1.bne.webcentral.com.au (202.139.236.254) 4 msec 4 msec 4 msec
13 fa0-0.gw2.bne.webcentral.com.au (202.139.236.2) 4 msec 4 msec 4 msec
14 fa0-1.gw1.bne.webcentral.com.au (202.139.236.254) 4 msec 8 msec 4 msec
15 fa0-0.gw2.bne.webcentral.com.au (202.139.236.2) 4 msec 8 msec 4 msec
16 fa0-1.gw1.bne.webcentral.com.au (202.139.236.254) 4 msec 4 msec 8 msec
17 fa0-0.gw2.bne.webcentral.com.au (202.139.236.2) 4 msec 4 msec 4 msec
18 fa0-1.gw1.bne.webcentral.com.au (202.139.236.254) 8 msec 8 msec 4 msec
19 fa0-0.gw2.bne.webcentral.com.au (202.139.236.2) 8 msec 8 msec 4 msec
20 fa0-1.gw1.bne.webcentral.com.au (202.139.236.254) 4 msec 4 msec 8 msec
21 fa0-0.gw2.bne.webcentral.com.au (202.139.236.2) 12 msec 4 msec 4 msec
22 fa0-1.gw1.bne.webcentral.com.au (202.139.236.254) 4 msec 8 msec 8 msec
23 fa0-0.gw2.bne.webcentral.com.au (202.139.236.2) 8 msec 8 msec 8 msec
24 fa0-1.gw1.bne.webcentral.com.au (202.139.236.254) 4 msec 8 msec 8 msec
25 fa0-0.gw2.bne.webcentral.com.au (202.139.236.2) 4 msec 8 msec 12 msec
26 fa0-1.gw1.bne.webcentral.com.au (202.139.236.254) 12 msec 8 msec 8 msec
27 fa0-0.gw2.bne.webcentral.com.au (202.139.236.2) 8 msec 4 msec 8 msec
28 fa0-1.gw1.bne.webcentral.com.au (202.139.236.254) 8 msec 8 msec 8 msec
29 fa0-0.gw2.bne.webcentral.com.au (202.139.236.2) 8 msec 8 msec 8 msec
30 fa0-1.gw1.bne.webcentral.com.au (202.139.236.254) 8 msec 8 msec 8 msec
gw1.bne#
Also, I have attached the config for Gw2.bne (Middle Router):-
controller E1 0/0
channel-group 0 timeslots 1-31
!
!
interface Loopback0
description Management
ip address 10.1.1.6 255.255.0.0
!
interface FastEthernet0/0
ip address 202.139.236.2 255.255.255.0
ip ospf message-digest-key 1 md5 7 0205534119541C14644F
speed 100
full-duplex
random-detect
!
interface Serial0/0:0
description N7065870L to Lvl5 Wickham St
ip address 203.147.255.185 255.255.255.252
ip nbar protocol-discovery
ip route-cache flow
service-policy output guaranteed
!
router ospf 7496
log-adjacency-changes
area 0 authentication message-digest
network 202.139.236.0 0.0.0.255 area 0
network 203.147.255.184 0.0.0.3 area 203.147.188.0
!
ip flow-export source Loopback0
ip flow-export version 5
ip flow-export destination 203.147.190.7 9992
ip classless
ip route 0.0.0.0 0.0.0.0 202.139.236.254
ip route 203.32.10.0 255.255.255.0 203.147.255.186
ip route 203.147.188.0 255.255.255.0 203.147.255.186
no ip http server
So why would Gw2.bne (the middle router) passed the Redistributed Routes to
Gw1.bne while itself (Gw2.bne) is using the supernet??
Thanks a lot
Best Regards,
Hunt Lee
Message Posted at:
http://www.groupstudy.com/form/read.php?f=7&i=42298&t=42298
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