04-07-2012 04:20 PM - edited 03-07-2019 06:00 AM
Hi All,
Here is my Lab Setup
2691 is BGP nei to R4 router and they are not directly connected.
2691 and R4 are in same AS 6500
2691 Config---
router ospf 1
network 3.3.3.3 0.0.0.0 area 0
Its advertising its loopback IP to OSPF domain.
router bgp 6500
no synchronization
bgp log-neighbor-changes
neighbor 6.6.6.6 remote-as 6500
neighbor 6.6.6.6 update-source Loopback3
2691Router# sh ip bgp
BGP table version is 6, local router ID is 3.3.3.3
Status codes: s suppressed, d damped, h history, * valid, > best, i - internal,
r RIB-failure, S Stale
Origin codes: i - IGP, e - EGP, ? - incomplete
Network Next Hop Metric LocPrf Weight Path
*>i50.1.1.0/24 6.6.6.6 0 100 0 i
*>i200.1.1.0 6.6.6.6 0 100 0 ?
*>i200.1.2.0 6.6.6.6 0 100 0 ?
*>i200.1.3.0 6.6.6.6 0 100 0 ?
*>i200.1.4.0 6.6.6.6 0 100 0 ?
2691Router# sh ip bgp summ
BGP router identifier 3.3.3.3, local AS number 6500
BGP table version is 6, main routing table version 6
5 network entries using 585 bytes of memory
5 path entries using 260 bytes of memory
3/2 BGP path/bestpath attribute entries using 372 bytes of memory
0 BGP route-map cache entries using 0 bytes of memory
0 BGP filter-list cache entries using 0 bytes of memory
BGP using 1217 total bytes of memory
BGP activity 25/20 prefixes, 25/20 paths, scan interval 60 secs
Neighbor V AS MsgRcvd MsgSent TblVer InQ OutQ Up/Down State/PfxRcd
6.6.6.6 4 6500 8770 8763 6 0 0 00:21:00 5
R4 Router
router ospf 11
log-adjacency-changes
network 6.6.6.6 0.0.0.0 area 0
router bgp 6500
no synchronization
bgp log-neighbor-changes
network 50.1.1.0 mask 255.255.255.0
redistribute connected route-map FILTER
neighbor 3.3.3.3 remote-as 6500
neighbor 3.3.3.3 update-source Loopback6
access-list 50 permit 200.1.1.0
access-list 50 permit 200.1.3.0
access-list 50 permit 200.1.2.0
access-list 50 permit 200.1.4.0
!
route-map FILTER permit 10
match ip address 50
R4# sh ip bgp summ
BGP router identifier 10.4.4.1, local AS number 6500
BGP table version is 26, main routing table version 26
5 network entries using 585 bytes of memory
5 path entries using 260 bytes of memory
3/2 BGP path/bestpath attribute entries using 372 bytes of memory
0 BGP route-map cache entries using 0 bytes of memory
0 BGP filter-list cache entries using 0 bytes of memory
BGP using 1217 total bytes of memory
BGP activity 15/10 prefixes, 15/10 paths, scan interval 60 secs
Neighbor V AS MsgRcvd MsgSent TblVer InQ OutQ Up/Down State/PfxRcd
3.3.3.3 4 6500 8767 8778 26 0 0 00:25:23 0
We can see that 2691 and R4 are BGP neis and 2691 has 200.1.x.x routes in its route table.
My question is why from 2691 router i am unable to ping any route learned by BGP from R4????????????????????????????????????????
2691Router# ping 50.1.1.0
Type escape sequence to abort.
Sending 5, 100-byte ICMP Echos to 50.1.1.0, timeout is 2 seconds:
.....
Success rate is 0 percent (0/5)
2691Router#ping 200.1.2.0
Type escape sequence to abort.
Sending 5, 100-byte ICMP Echos to 200.1.2.0, timeout is 2 seconds:
.....
Success rate is 0 percent (0/5)
Thanks
MAhesh
Solved! Go to Solution.
04-07-2012 06:16 PM
Mahesh,
R1> show ip bgpBGP table version is 5, local router ID is 200.200.200.1Status codes: s suppressed, d damped, h history, * valid, > best, i - internal, r RIB-failureOrigin codes: i - IGP, e - EGP, ? - incomplete Network Next Ho...A. When BGP tries to install the bestpath prefix into Routing Information Base (RIB) (for example, the IP Routing table), RIB might reject the BGP route due to any of these reasons:
Route with better administrative distance already present in IGP. For example, if a static route already exists in IP Routing table.
Memory failure.
The number of routes in VPN routing/forwarding (VRF) exceeds the route-limit configured under the VRF instance.
In such cases, the prefixes that are rejected for these reasons are identified by r RIB Failure in the show ip bgp command output and are not advertised to the peers. This feature was first made available in Cisco IOS Software Release 12.2(08.05)T.
here is the link:
http://www.cisco.com/en/US/tech/tk365/technologies_q_and_a_item09186a00800949e8.shtml
So, since these routes don't show up in your BGP routing table, you can delete the "red conn" under the OSPF and create static routes pointing to null 0 interface and advertise them that way
Here is link to follow:
http://www.cisco.com/en/US/tech/tk364/technologies_tech_note09186a00801c9a6e.shtml
http://www.cciecandidate.com/?p=97
HTH
04-07-2012 04:39 PM
Hi Mahesh,
2691Router# ping 50.1.1.0
Type escape sequence to abort.
Sending 5, 100-byte ICMP Echos to 50.1.1.0, timeout is 2 seconds:
In the scenario, you are pinging the 50.1.1.0 0 is not a host address. A host address would be 50.1.1.1, 2, 3 etc..
HTH
04-07-2012 04:47 PM
Hi Reza,
Thanks for reply.
I ping the correct host IP now still same thing
2691Router#ping 50.1.1.1
Type escape sequence to abort.
Sending 5, 100-byte ICMP Echos to 50.1.1.1, timeout is 2 seconds:
.....
Success rate is 0 percent (0/5)
2691Router#ping 200.1.2.1
Type escape sequence to abort.
Sending 5, 100-byte ICMP Echos to 200.1.2.1, timeout is 2 seconds:
.....
Success rate is 0 percent (0/5)
04-07-2012 04:56 PM
Mahesh,
On R4 try this:
ip route 50.1.1.0 255.255.255.0 null 0
under ospf
redis static
now, try pinging 50.1.1.1 and see what happens
HTH
04-07-2012 05:02 PM
Hi Reza,
I tried as below
R4(config)#ip route 50.1.1.0 255.255.255.0 null 0
R4(config)#
R4(config)#router ospf 11
R4(config-router)#re
R4(config-router)#redistribute static
% Only classful networks will be redistributed
R4#exit
[Connection to 6.6.6.6 closed by foreign host]
2691Router#sh ip bgp
BGP table version is 38, local router ID is 3.3.3.3
Status codes: s suppressed, d damped, h history, * valid, > best, i - internal,
r RIB-failure, S Stale
Origin codes: i - IGP, e - EGP, ? - incomplete
Network Next Hop Metric LocPrf Weight Path
*>i50.1.1.0/24 6.6.6.6 0 100 0 i
*>i200.1.1.0 6.6.6.6 0 100 0 ?
*>i200.1.2.0 6.6.6.6 0 100 0 ?
*>i200.1.3.0 6.6.6.6 0 100 0 ?
*>i200.1.4.0 6.6.6.6 0 100 0 ?
2691Router# ping 50.1.1.1
Type escape sequence to abort.
Sending 5, 100-byte ICMP Echos to 50.1.1.1, timeout is 2 seconds:
.....
Success rate is 0 percent (0/5)
Still no luck
Thanks
04-07-2012 05:05 PM
Sorry Mahesh,
try this under ospf
redistribute static subnets
04-07-2012 05:09 PM
Hi Reza,
Did that still no luck
Thanks
MAhesh
04-07-2012 05:16 PM
Mahesh,
Can you post sh run from both routers?
Reza
04-07-2012 05:24 PM
Hi Reza,
Sh run from both routers is attached to original post
Thanks
04-07-2012 05:46 PM
Mahesh,
The config on the attached vs what you post above are different. Below is the BGP config from r4 and it is different from what you posted in your first post
Also
on both routers under ospf can you add
red conn
and delete
redistribute connected route-map FILTER
under BGP and test again?
router bgp 6500
no synchronization
bgp log-neighbor-changes
--More-- network 50.1.1.0 mask 255.255.255.0
redistribute connected route-map FILTER
neighbor 1.1.1.1 remote-as 5500
neighbor 1.1.1.1 ebgp-multihop 2
neighbor 1.1.1.1 update-source Loopback5
neighbor 3.3.3.3 remote-as 6500
neighbor 3.3.3.3 update-source Loopback6
neighbor 10.1.45.1 remote-as 5500
no auto-summary
04-07-2012 05:56 PM
Hi Reza,
I did as per you.
Now sh ip bgp on 2691 shows
2691Router# sh ip bgp
BGP table version is 16, local router ID is 3.3.3.3
Status codes: s suppressed, d damped, h history, * valid, > best, i - internal,
r RIB-failure, S Stale
Origin codes: i - IGP, e - EGP, ? - incomplete
Network Next Hop Metric LocPrf Weight Path
r>i50.1.1.0/24 6.6.6.6 0 100 0 i
r>i200.1.1.0 6.6.6.6 0 100 0 ?
r>i200.1.2.0 6.6.6.6 0 100 0 ?
r>i200.1.3.0 6.6.6.6 0 100 0 ?
r>i200.1.4.0 6.6.6.6 0 100 0 ?
Do u know why it shows r now??????
Also sh ip route on 2691 shows no BGP routes but show as OSPF E2
O E2 200.1.4.0/24 [110/20] via 192.168.5.2, 00:02:32, FastEthernet0/1
1.0.0.0/32 is subnetted, 1 subnets
O E2 1.1.1.1 [110/20] via 192.168.5.2, 00:46:04, FastEthernet0/1
50.0.0.0/24 is subnetted, 1 subnets
O E2 50.1.1.0 [110/20] via 192.168.5.2, 00:02:32, FastEthernet0/1
Ping works now
2691Router# ping 50.1.1.1
Type escape sequence to abort.
Sending 5, 100-byte ICMP Echos to 50.1.1.1, timeout is 2 seconds:
!!!!!
Success rate is 100 percent (5/5), round-trip min/avg/max = 1/2/4 ms
2691Router# ping 200.1.2.1
Type escape sequence to abort.
Sending 5, 100-byte ICMP Echos to 200.1.2.1, timeout is 2 seconds:
!!!!!
Success rate is 100 percent (5/5), round-trip min/avg/max = 1/2/4 ms
So we have distributed connected subnets into OSPF and we still have BGP neis but no BGP routes in sh ip route
of 2691.
Can you please explain above things
Thanks
04-07-2012 06:16 PM
Mahesh,
R1> show ip bgpBGP table version is 5, local router ID is 200.200.200.1Status codes: s suppressed, d damped, h history, * valid, > best, i - internal, r RIB-failureOrigin codes: i - IGP, e - EGP, ? - incomplete Network Next Ho...A. When BGP tries to install the bestpath prefix into Routing Information Base (RIB) (for example, the IP Routing table), RIB might reject the BGP route due to any of these reasons:
Route with better administrative distance already present in IGP. For example, if a static route already exists in IP Routing table.
Memory failure.
The number of routes in VPN routing/forwarding (VRF) exceeds the route-limit configured under the VRF instance.
In such cases, the prefixes that are rejected for these reasons are identified by r RIB Failure in the show ip bgp command output and are not advertised to the peers. This feature was first made available in Cisco IOS Software Release 12.2(08.05)T.
here is the link:
http://www.cisco.com/en/US/tech/tk365/technologies_q_and_a_item09186a00800949e8.shtml
So, since these routes don't show up in your BGP routing table, you can delete the "red conn" under the OSPF and create static routes pointing to null 0 interface and advertise them that way
Here is link to follow:
http://www.cisco.com/en/US/tech/tk364/technologies_tech_note09186a00801c9a6e.shtml
http://www.cciecandidate.com/?p=97
HTH
04-08-2012 07:48 AM
Hi Reza,
Thanks for repy.
I will go through the links which you provided.
Mahesh
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