From: Joseph Brunner (joe@affirmedsystems.com)
Date: Tue Sep 25 2007 - 00:32:35 ART
Admin down your ebgp peering sessions from AS 2 to AS 3 (R4) and AS 1 (R5)
neighbor x.x.x.x shutdown
remember ping uses outgoing interface unless your
ping x.x.x.x source Xx/x
to change the source ping.
Then post (a fresh thread, please)
All router's
Show ip int brief
Show ip route
Show ip bgp summ (admin back everything)
Show ip bgp
Then I'll draw it all out on my 11x17's and help you more.
-Joe
-----Original Message-----
From: John [mailto:jgarrison1@austin.rr.com]
Sent: Tuesday, September 25, 2007 12:03 AM
To: Joseph Brunner; ccielab@groupstudy.com
Subject: Re: IWE BGP
Joeseph,
Thanks for the suggestions. Part of whats killing me is that from R1 I can
ping R2's inside (in respect to R1) interface but not the Outside and vice
versa, same with R3. Even though R3 cannot ping the "outside interfaces of
R1 and 2 it can ping across them to the ethernet/vlans hanging of R4 and 5.
debug ICMP shows nothing when I try to ping the "outside interfaces from R1,
R3or R2 . I just checked the answer key and according to ot my config is
correct, also this is the base lab for a number of BGP labs. I've set it up
from scratch at least three times with no problem. I swear I've done it the
same everytime. I of course got connectivity when I redistributed eigrp
into bgp on R1 and 2
the lab looks like this R1---R3---R2
| |
R4 R5
R1,2 and 3 are in AS 2. R4 is in AS 3. R5 is in AS 1
I have eigrp running in AS 2 on the inside interfaces of R1 and 2 and both
interfaces of R3.
Heres the sh ip bgp sum's fro R1, 2, and 3
Rack1R1#sh ip bgp sum
BGP router identifier 155.1.146.1, local AS number 2
BGP table version is 16, main routing table version 16
3 network entries using 351 bytes of memory
3 path entries using 156 bytes of memory
4/3 BGP path/bestpath attribute entries using 496 bytes of memory
2 BGP AS-PATH entries using 48 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 1051 total bytes of memory
BGP activity 7/4 prefixes, 9/6 paths, scan interval 60 secs
Neighbor V AS MsgRcvd MsgSent TblVer InQ OutQ Up/Dow
155.1.13.3 4 2 284 289 16 0 0 04:39:
155.1.23.2 4 2 290 290 16 0 0 04:40:
155.1.146.4 4 3 284 293 16 0 0 03:57:
Rack1R2#sh ip bgp sum
BGP router identifier 155.1.23.2, local AS number 2
BGP table version is 16, main routing table version 16
3 network entries using 351 bytes of memory
3 path entries using 156 bytes of memory
4/3 BGP path/bestpath attribute entries using 496 bytes of memory
2 BGP AS-PATH entries using 48 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 1051 total bytes of memory
BGP activity 7/4 prefixes, 9/6 paths, scan interval 60 secs
Neighbor V AS MsgRcvd MsgSent TblVer InQ OutQ Up/Down
State/PfxRcd
155.1.0.5 4 1 272 285 16 0 0 03:57:58 1
155.1.13.1 4 2 290 290 16 0 0 04:40:15 1
155.1.23.3 4 2 283 288 16 0 0 04:38:57 1
Rack1R3#sh ip bgp sum
BGP router identifier 155.1.37.3, local AS number 2
BGP table version is 16, main routing table version 16
3 network entries using 351 bytes of memory
3 path entries using 156 bytes of memory
4/3 BGP path/bestpath attribute entries using 496 bytes of memory
2 BGP AS-PATH entries using 48 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 1051 total bytes of memory
BGP activity 7/4 prefixes, 9/6 paths, scan interval 60 secs
Neighbor V AS MsgRcvd MsgSent TblVer InQ OutQ Up/Down
State/PfxRcd
155.1.13.1 4 2 289 284 16 0 0 04:39:34 1
155.1.23.2 4 2 289 284 16 0 0 04:39:04 1
I'm doing something incredibly stupid and I just can't see it arrrrggggg
----- Original Message -----
From: "Joseph Brunner" <joe@affirmedsystems.com>
To: "'John'" <jgarrison1@austin.rr.com>; <ccielab@groupstudy.com>
Sent: Monday, September 24, 2007 6:49 PM
Subject: RE: IWE BGP
> John, I have tried to go through this config; and draw it out in my head.
>
> "Show ip interface brief" and "show ip bgp summary" in the future would
> also
> be helpful to us to provide more assistance ;)
>
> Here is how I normally go about solving these issues in my lab...
>
> Do some "debug ip icmp" + "term mon" on the routers send and receiving the
> pings, lets see what's failing. Debug ip packet <ACL> also helps, again
> with
> term mon turned on, or "logging console" if you are directly connected.
>
> The next hop is automatically reset to the outgoing interface for EBGP (or
> if the update-source is set, it will use that interface). I suspect a
> broken
> igp underlying your perhaps working bgp config.
>
> -----Original Message-----
> From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On Behalf Of
> John
> Sent: Monday, September 24, 2007 9:19 PM
> To: John; ccielab@groupstudy.com
> Subject: Re: IWE BGP
>
> error R2 not R1 is connected to R5 via EBGP
>
> ----- Original Message -----
> From: "John" <jgarrison1@austin.rr.com>
> To: <ccielab@groupstudy.com>
> Sent: Monday, September 24, 2007 7:03 PM
> Subject: IWE BGP
>
>
>> This is killing me I've set up this same lab a number of times. It
>> appears
>> that the BGP and routing tables are correct at all routers.R1 R2 R3 are
>> in
>
>> AS2
>> R4 is in AS3 and R5 is in AS1. From R4 I cannot ping R3 or R5's
>> ethernet/vlan(155.1.37.0, 155.1.5.0), but from R3 I can ping R4 and R5's
>> ethernet/vlan here is the relevant info for R4
>> Network Next Hop Metric LocPrf Weight Path
>> *> 155.1.5.0/24 155.1.146.1 0 2 1 i
>> *> 155.1.37.0/24 155.1.146.1 0 2 i
>> *> 204.12.1.0 0.0.0.0 0 32768 i
>> Rack1R4#sh ip route
>> C 204.12.1.0/24 is directly connected, FastEthernet0/1
>> 155.1.0.0/24 is subnetted, 3 subnets
>> C 155.1.146.0 is directly connected, FastEthernet0/0
>> B 155.1.5.0 [20/0] via 155.1.146.1, 00:37:13
>> B 155.1.37.0 [20/0] via 155.1.146.1, 00:37:13
>> Rack1R4#sh ip bgp 155.1.5.0
>> BGP routing table entry for 155.1.5.0/24, version 2
>> Paths: (1 available, best #1, table Default-IP-Routing-Table)
>> Not advertised to any peer
>> 2 1
>> 155.1.146.1 from 155.1.146.1 (155.1.146.1)
>> Origin IGP, localpref 100, valid, external, best
>> Rack1R4#sh ip bgp 155.1.37.0
>> BGP routing table entry for 155.1.37.0/24, version 3
>> Paths: (1 available, best #1, table Default-IP-Routing-Table)
>> Not advertised to any peer
>> 2
>> 155.1.146.1 from 155.1.146.1 (155.1.146.1)
>> Origin IGP, localpref 100, valid, external, best
>>
>> Heres where it gets weird R4 is connected to R1 via EBGP and from R1 I
>> can
>> ping R3 and R4's ethernet /vlan(155.1.37.0, 204.12.1.0), but not
>> R5's(155.1.5.0). From R1 I cannot reach 155.1.0.0 which is connecting R1
>> to
>> R5 via EBGP, but I can reach 155.1.23.0 which connects R3 to R2 via IBGP
>> and
>> EIGRP heres R1's relevant info
>> Network Next Hop Metric LocPrf Weight Path
>> *>i155.1.5.0/24 155.1.23.2 0 100 0 1 i
>> *>i155.1.37.0/24 155.1.13.3 0 100 0 i
>> *> 204.12.1.0 155.1.146.4 0 0 3 i
>> Rack1R1#sh ip route
>> Codes: C - connected, S - static, 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
>> i - IS-IS, su - IS-IS summary, 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 204.12.1.0/24 [20/0] via 155.1.146.4, 00:53:17
>> 155.1.0.0/24 is subnetted, 5 subnets
>> C 155.1.146.0 is directly connected, FastEthernet0/0
>> D 155.1.23.0 [90/2681856] via 155.1.13.3, 01:37:10, Serial2/1
>> C 155.1.13.0 is directly connected, Serial2/1
>> B 155.1.5.0 [200/0] via 155.1.23.2, 00:54:49
>> B 155.1.37.0 [200/0] via 155.1.13.3, 01:30:38
>> Rack1R1#sh ip bgp 155.1.5.0
>> BGP routing table entry for 155.1.5.0/24, version 6
>> Paths: (1 available, best #1, table Default-IP-Routing-Table)
>> Advertised to update-groups:
>> 1
>> 1
>> 155.1.23.2 (metric 2681856) from 155.1.23.2 (155.1.23.2)
>> Origin IGP, metric 0, localpref 100, valid, internal, best
>>
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