From: Jason Gardiner (gardiner@xxxxxxxxxx)
Date: Sun Aug 19 2001 - 13:08:32 GMT-3
Hmmm. It may have been from different reasons as well. I noticed that
you had 2 loopbacks on most if not all of the routers. If BGP was using
one and OSPF was using the other, wouldn't that make things go haywire?
If you added one of the loopbacks after setting up OSPF, that could have
happened. And removing the OSPF and later readding it could have resulted
in the OSPF RID synching up with BGP's.
I'm thinking that one of my top priorities in the exam is making sure all
addressing, especially loopbacks is in place before I even think about
adding routing protocols.
Thanks,
Jason Gardiner
Supervisor, Engineering Services
Sprint E|Solutions
"You can swim all day in the Sea of Knowledge and
still come out completely dry. Most people do."
- Norton Juster
On Sun, 19 Aug 2001, Michael Wong wrote:
> Things are definitely strange !!!! ..... I thought I'd get rid of OSPF and us
e EIGRP instead. Guess what ..... it worked perfectly. There was nothing fancy
with the EIGRP configs, it was running as an IGP in place of OSPF. All the rout
es came through to Alta including the default route originated from Taos.
>
> So I investigated further with OSPF and here is what I found .....
>
> I changed the network statement in the OSPF process on Aspen from "network 19
2.168.1.0 0.0.0.255 area 0" to two individual network statements with a quad ze
ro mask. So I used "network 192.168.1.222 0.0.0.0 area 0" and "network 192.168.
1.198 0.0.0.0 area 0". You wouldn't believe it ..... but the after that change,
the routes were advertised through to Alta. However only the actual network ro
utes were advertised, no default route from Taos. I couldn't believe it, so I p
ut it back to the network wildcard mask and the routes weren't advertised, then
back to the quad zero mask and routes came back. This is all on the Aspen rout
er .... bizarre ???
>
> I also played with the wildcard mask on the Vail and Telluride routers, going
between a network mask and quad zero mask ..... however this had no impact on
whether the routes came through to Alta. It was only the changes in Aspen that
made the routes come through.
>
> As documented in Cisco, the network statement under the OSPF process specifie
s which interface should be included in the OSPF routing process. It shouldn't
affect how routes are advertised etc. However I have read in certain instances
on this mailing list that people have had problems with using a quad zero mask
as opposed to a network range mask.
>
> What do you guys think ???? .... Dodgy IOS ???? .... or does it go deeper tha
n that ....
>
> MW :)
>
>
>
>
> -----Original Message-----
> From: Daniel C. Young [mailto:danyoung99@mediaone.net]
> Sent: Sunday, 19 August 2001 2:04 pm
> To: Michael Wong; 'Peter Rybaczyk'
> Cc: 'Groupstudy - CCIELAB (E-mail)'
> Subject: RE: BGP synchronisation: Doyle page 175
>
>
>
> Mike,
>
> That's funny. I see 'next-hop self' on Vail pointing to Telluride, but if
> you check Telluride's BGP table all the prefixes learned from AS 300 and AS
> 200 have not had their next-hop attribute altered. The issues still seems to
> be that you have a next-hop reachability issue on Telluride. But why has
> Vail ignore the 'next-hop self' command, though? Strange...
>
> A 'clear ip bgp *' perhaps on Vail?
>
> Let me know...
> Daniel
>
> -----Original Message-----
> From: nobody@groupstudy.com [mailto:nobody@groupstudy.com]On Behalf Of
> Michael Wong
> Sent: Saturday, 18 August 2001 8:24 PM
> To: 'Peter Rybaczyk'
> Cc: Groupstudy - CCIELAB (E-mail)
> Subject: RE: BGP synchronisation: Doyle page 175
>
>
> OK .... here we go (ignore the real names of the routers), I attached the
> configs and outputs for Tahoe, Vail, Aspen, Telluride and Alta.
>
> All the routes from Alta seem to be propagated out to the other AS's,
> however nothing is being propagated into Alta. It funny how Tahoe gets the
> routes, but Alta doesn't ..... am I going crazy here ????!!!!
>
> Thanking you in advance ...... MW :)
>
>
> *** Tahoe ***
> !
> router bgp 300
> bgp log-neighbor-changes
> network 192.168.1.212 mask 255.255.255.252
> network 192.168.250.0
> neighbor 192.168.1.209 remote-as 100
> neighbor 192.168.1.209 default-originate
> !
>
> p1r1#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
> N1 - OSPF NSSA external type 1, N2 - OSPF NSSA external type 2
> 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, o - ODR
>
> Gateway of last resort is not set
>
> B 192.168.75.0/24 [20/0] via 192.168.1.209, 00:34:58
> B 192.168.200.0/24 [20/0] via 192.168.1.209, 01:19:06
> C 192.168.250.0/24 is directly connected, Loopback0
> B 192.168.50.0/24 [20/0] via 192.168.1.209, 00:34:58
> 192.168.1.0/30 is subnetted, 4 subnets
> B 192.168.1.200 [20/0] via 192.168.1.209, 00:34:58
> B 192.168.1.216 [20/0] via 192.168.1.209, 01:19:06
> C 192.168.1.208 is directly connected, Serial0/0
> C 192.168.1.212 is directly connected, Loopback1
> B 192.168.100.0/24 [20/0] via 192.168.1.209, 01:19:06
>
> p1r1#sh ip bgp
> BGP table version is 17, local router ID is 192.168.250.1
> 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
> *> 192.168.1.200/30 192.168.1.209 0 100 400 i
> *> 192.168.1.212/30 0.0.0.0 0 32768 i
> *> 192.168.1.216/30 192.168.1.209 0 100 200 i
> *> 192.168.50.0 192.168.1.209 0 100 400 i
> *> 192.168.75.0 192.168.1.209 0 100 400 i
> *> 192.168.100.0 192.168.1.209 0 100 200 i
> *> 192.168.200.0 192.168.1.209 0 100 200 i
> *> 192.168.250.0 0.0.0.0 0 32768 i
>
> p1r1#sh ip bgp summary
> BGP router identifier 192.168.250.1, local AS number 300
> BGP table version is 17, main routing table version 17
> 8 network entries and 8 paths using 968 bytes of memory
> 3 BGP path attribute entries using 292 bytes of memory
> BGP activity 12/4 prefixes, 12/4 paths
>
> Neighbor V AS MsgRcvd MsgSent TblVer InQ OutQ Up/Down
> State/PfxRcd
> 192.168.1.209 4 100 88 84 17 0 0 01:19:42 6
>
>
>
> *** Vail ***
> !
> router ospf 100
> redistribute bgp 100 subnets
> network 192.168.1.220 0.0.0.3 area 0
> log-adjacency-changes
> !
> router bgp 100
> bgp log-neighbor-changes
> neighbor 192.168.1.197 remote-as 100
> neighbor 192.168.1.197 next-hop-self
> neighbor 192.168.1.210 remote-as 300
> neighbor 192.168.1.225 remote-as 200
> !
>
> p1r5#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
> N1 - OSPF NSSA external type 1, N2 - OSPF NSSA external type 2
> 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, ia - IS-IS inter
> area
> * - candidate default, U - per-user static route, o - ODR
> P - periodic downloaded static route
>
> Gateway of last resort is 192.168.1.210 to network 0.0.0.0
>
> O E2 192.168.75.0/24 [110/1] via 192.168.1.222, 00:23:56, Serial1/1
> B 192.168.200.0/24 [20/0] via 192.168.1.225, 01:08:09
> B 192.168.250.0/24 [20/0] via 192.168.1.210, 01:08:30
> O E2 192.168.50.0/24 [110/1] via 192.168.1.222, 00:23:56, Serial1/1
> 192.168.1.0/30 is subnetted, 7 subnets
> C 192.168.1.224 is directly connected, Serial1/3
> O E2 192.168.1.200 [110/1] via 192.168.1.222, 00:23:56, Serial1/1
> O 192.168.1.196 [110/791] via 192.168.1.222, 00:36:37, Serial1/1
> B 192.168.1.216 [20/0] via 192.168.1.225, 01:08:10
> C 192.168.1.220 is directly connected, Serial1/1
> C 192.168.1.208 is directly connected, Serial1/0
> B 192.168.1.212 [20/0] via 192.168.1.210, 01:08:31
> B 192.168.100.0/24 [20/0] via 192.168.1.225, 01:08:10
> B* 0.0.0.0/0 [20/0] via 192.168.1.210, 00:33:44
>
> p1r5#sh ip bgp
> BGP table version is 18, local router ID is 192.168.1.226
> 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
> *> 0.0.0.0 192.168.1.210 0 300 i
> *>i192.168.1.200/30 192.168.1.205 0 100 0 400 i
> *> 192.168.1.212/30 192.168.1.210 0 0 300 i
> *> 192.168.1.216/30 192.168.1.225 0 0 200 i
> *>i192.168.50.0 192.168.1.205 0 100 0 400 i
> *>i192.168.75.0 192.168.1.205 0 100 0 400 i
> *> 192.168.100.0 192.168.1.225 0 0 200 i
> *> 192.168.200.0 192.168.1.225 0 0 200 i
> *> 192.168.250.0 192.168.1.210 0 0 300 i
>
>
> *** Aspen ***
> !
> router ospf 100
> log-adjacency-changes
> network 192.168.1.0 0.0.0.255 area 0
> !
>
> p1r2#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
> N1 - OSPF NSSA external type 1, N2 - OSPF NSSA external type 2
> 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, o - ODR
>
> Gateway of last resort is not set
>
> O E2 192.168.75.0/24 [110/1] via 192.168.1.197, 00:26:02, Ethernet0/0
> O E2 192.168.200.0/24 [110/1] via 192.168.1.221, 00:38:44, Serial0/0
> O E2 192.168.250.0/24 [110/1] via 192.168.1.221, 00:38:44, Serial0/0
> O E2 192.168.50.0/24 [110/1] via 192.168.1.197, 00:26:03, Ethernet0/0
> 192.168.1.0/30 is subnetted, 5 subnets
> O E2 192.168.1.200 [110/1] via 192.168.1.197, 00:26:03, Ethernet0/0
> C 192.168.1.196 is directly connected, Ethernet0/0
> O E2 192.168.1.216 [110/1] via 192.168.1.221, 00:38:44, Serial0/0
> C 192.168.1.220 is directly connected, Serial0/0
> O E2 192.168.1.212 [110/1] via 192.168.1.221, 00:38:45, Serial0/0
> O E2 192.168.100.0/24 [110/1] via 192.168.1.221, 00:38:45, Serial0/0
>
>
> *** Telluride ***
> !
> router ospf 100
> log-adjacency-changes
> redistribute bgp 100 subnets
> network 192.168.1.196 0.0.0.3 area 0
> !
> router bgp 100
> bgp log-neighbor-changes
> neighbor 192.168.1.205 remote-as 400
> neighbor 192.168.1.221 remote-as 100
> neighbor 192.168.1.221 next-hop-self
> !
>
> p1r6#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
> N1 - OSPF NSSA external type 1, N2 - OSPF NSSA external type 2
> 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, ia - IS-IS inter
> area
> * - candidate default, U - per-user static route, o - ODR
> P - periodic downloaded static route
>
> Gateway of last resort is not set
>
> B 192.168.75.0/24 [20/0] via 192.168.1.205, 00:27:17
> O E2 192.168.200.0/24 [110/1] via 192.168.1.198, 00:39:59, FastEthernet0/0
> O E2 192.168.250.0/24 [110/1] via 192.168.1.198, 00:39:59, FastEthernet0/0
> B 192.168.50.0/24 [20/0] via 192.168.1.205, 00:27:17
> 192.168.1.0/30 is subnetted, 6 subnets
> B 192.168.1.200 [20/0] via 192.168.1.205, 00:27:17
> C 192.168.1.204 is directly connected, FastEthernet0/1
> C 192.168.1.196 is directly connected, FastEthernet0/0
> O E2 192.168.1.216 [110/1] via 192.168.1.198, 00:40:00, FastEthernet0/0
> O 192.168.1.220 [110/65] via 192.168.1.198, 00:40:00, FastEthernet0/0
> O E2 192.168.1.212 [110/1] via 192.168.1.198, 00:40:00, FastEthernet0/0
> O E2 192.168.100.0/24 [110/1] via 192.168.1.198, 00:40:00, FastEthernet0/0
>
>
> p1r6#sh ip bgp
> BGP table version is 12, local router ID is 192.168.1.206
> 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
> * i0.0.0.0 192.168.1.210 100 0 300 i
> *> 192.168.1.200/30 192.168.1.205 0 0 400 i
> * i192.168.1.212/30 192.168.1.210 0 100 0 300 i
> * i192.168.1.216/30 192.168.1.225 0 100 0 200 i
> *> 192.168.50.0 192.168.1.205 0 0 400 i
> *> 192.168.75.0 192.168.1.205 0 0 400 i
> * i192.168.100.0 192.168.1.225 0 100 0 200 i
> * i192.168.200.0 192.168.1.225 0 100 0 200 i
> * i192.168.250.0 192.168.1.210 0 100 0 300 i
>
> p1r6#sh ip bgp summary
> BGP router identifier 192.168.1.206, local AS number 100
> BGP table version is 12, main routing table version 12
> 9 network entries and 9 paths using 1197 bytes of memory
> 4 BGP path attribute entries using 240 bytes of memory
> 3 BGP AS-PATH entries using 72 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 activity 13/175 prefixes, 13/4 paths, scan interval 15 secs
>
> Neighbor V AS MsgRcvd MsgSent TblVer InQ OutQ Up/Down
> State/PfxRcd
> 192.168.1.205 4 400 48 49 12 0 0 00:30:32 3
> 192.168.1.221 4 100 49 51 12 0 0 00:43:36 6
>
>
> *** Alta ***
> !
> router bgp 400
> bgp log-neighbor-changes
> network 192.168.1.200 mask 255.255.255.252
> network 192.168.50.0
> network 192.168.75.0
> neighbor 192.168.1.206 remote-as 100
> !
>
> p1r3#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
> N1 - OSPF NSSA external type 1, N2 - OSPF NSSA external type 2
> 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, o - ODR
>
> Gateway of last resort is not set
>
> C 192.168.75.0/24 is directly connected, Loopback1
> C 192.168.50.0/24 is directly connected, Loopback0
> 192.168.1.0/30 is subnetted, 2 subnets
> C 192.168.1.200 is directly connected, Loopback2
> C 192.168.1.204 is directly connected, Ethernet0/0
>
> p1r3#sh ip bgp
> BGP table version is 6, local router ID is 192.168.75.1
> 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
> *> 192.168.1.200/30 0.0.0.0 0 32768 i
> *> 192.168.50.0 0.0.0.0 0 32768 i
> *> 192.168.75.0 0.0.0.0 0 32768 i
>
> p1r3#sh ip bgp summary
> BGP router identifier 192.168.75.1, local AS number 400
> BGP table version is 6, main routing table version 6
> 3 network entries and 3 paths using 363 bytes of memory
> 1 BGP path attribute entries using 148 bytes of memory
> BGP activity 4/1 prefixes, 4/1 paths
>
> Neighbor V AS MsgRcvd MsgSent TblVer InQ OutQ Up/Down
> State/PfxRcd
> 192.168.1.206 4 100 34 33 6 0 0 00:29:35 0
>
>
>
>
>
> -----Original Message-----
> From: Peter Rybaczyk [mailto:psrsam@globalins.com]
> Sent: Sunday, 19 August 2001 2:23 am
> To: Michael Wong
> Cc: Groupstudy - CCIELAB (E-mail)
> Subject: Re: BGP synchronisation: Doyle page 175
>
>
> Michael,
> I duplicated the setup but can't duplicate the problem. Can you send
> relevent portions of your configs (BGP and OSPF parts) for all of the
> routers? Also the IP table for Telluride would be helpful.
> Thanks.
> Peter
>
> Michael Wong wrote:
>
> > BGP gurus ..... I am trying to do the example in Doyle Vol II, page 175
> with BGP synchronisation and OSPF.
> >
> > I have BGP routes going between AS100, AS300 and AS200 ..... however for
> some reason the routes from these AS's are not being advertised into AS400.
> If I do a debug on the Telluride router I get the output below. I cannot
> seem to find what this output means anywhere on the Cisco site. I am
> assuming it's got something to do with these routes not being able to be
> propagated to Alta.
> >
> > 00:07:16: BGP(0): no valid path for 0.0.0.0/0
> > 00:07:16: BGP(0): no valid path for 192.168.1.208/30
> > 00:07:16: BGP(0): no valid path for 192.168.1.212/30
> > 00:07:16: BGP(0): no valid path for 192.168.1.216/30
> > 00:07:16: BGP(0): no valid path for 192.168.1.224/30
> > 00:07:16: BGP(0): no valid path for 192.168.100.0/24
> > 00:07:16: BGP(0): no valid path for 192.168.200.0/24
> > 00:07:16: BGP(0): no valid path for 192.168.250.0/24
> >
> > If I look in Alta's BGP routing table, all I see is the following (no
> routes from the other AS's), even though it has an adjacency with Telluride
> ....
> >
> > BGP table version is 6, local router ID is 192.168.75.1
> > 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
> > *> 192.168.1.200/30 0.0.0.0 0 32768 i
> > *> 192.168.50.0 0.0.0.0 0 32768 i
> > *> 192.168.75.0 0.0.0.0 0 32768 i
> >
> > Telluride's BGP table has all the routes so I'm assuming that
> synchronisation is OK.
> >
> > BGP table version is 6, local router ID is 192.168.1.206
> > 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
> > * i0.0.0.0 192.168.1.221 100 0 100 i
> > *> 192.168.1.200/30 192.168.1.205 0 0 400 i
> > * i192.168.1.212/30 192.168.1.221 0 100 0 300 i
> > * i192.168.1.216/30 192.168.1.221 0 100 0 100 i
> > *> 192.168.50.0 192.168.1.205 0 0 400 i
> > *> 192.168.75.0 192.168.1.205 0 0 400 i
> > * i192.168.100.0 192.168.1.221 0 100 0 100 i
> > * i192.168.200.0 192.168.1.221 409600 100 0 100 i
> > * i192.168.250.0 192.168.1.221 0 100 0 300 i
> >
> > The previous example used the same network without BGP synchronisation and
> just using IBGP, this was OK and routes were propagated into AS400.
> >
> > Help please ....... MW
> > **Please read:http://www.groupstudy.com/list/posting.html
> **Please read:http://www.groupstudy.com/list/posting.html
> **Please read:http://www.groupstudy.com/list/posting.html
**Please read:http://www.groupstudy.com/list/posting.html
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