[j-nsp] OSPF Debug

[Jack.W.Parks at alltel.com]

Is this a local patch fiber patch, or over some long haul transport?
Could it be different default MTUs for each of the PICs (don't have any
PB-2GE-SX)?

Some Questions:

Are the MTUs the same?
Is the Hello Timer the same?
Is the Deal Interval the same?


Jack

-----Original Message-----
From: juniper-nsp-bounces at puck.nether.net
[mailto:juniper-nsp-bounces at puck.nether.net] On Behalf Of Scotty
Sent: Sunday, February 22, 2004 8:32 PM
To: 'Raymond Cheh'; juniper-nsp at puck.nether.net
Subject: RE: [j-nsp] OSPF Debug


Raymond,

> I'd suggest doing some 'traceoptions hello detail' and that'd capture 
> the hello packets on both routers. Also, I personally like to do 
> monitor traffic on the interfaces as it is simpler to see if you 
> receives the OSPF packets on the interfaces from the other routers.

Ok I did that on the M160 and I get this (summarized)

# run monitor traffic interface ge-0/0/0.0
verbose output suppressed, use <detail> or <extensive> for full protocol
decode Listening on ge-0/0/0.0, capture size 96 bytes

21:04:35.454751 Out IP 10.10.10.3 > 224.0.0.5: OSPFv2 Hello length: 44
21:04:41.121834  In IP 10.10.10.4.4405 > 10.10.10.3.bgp: P
3886338746:3886338773(27) ack 145002704 win 16384 <nop,nop,timestamp
1665163887 130574421>: BGP, length: 27 21:04:43.285516 Out IP 10.10.10.3
> 224.0.0.5: OSPFv2 Hello length: 44 21:04:51.466302 Out IP 10.10.10.3 >
224.0.0.5: OSPFv2 Hello length: 44 21:04:51.619965  In IP
10.10.10.4.4405 > 10.10.10.3.bgp: P 27:111(84) ack 1 win 16384
<nop,nop,timestamp 1665164936 130575218>: BGP, length: 84 ^C 94 packets
received by filter 0 packets dropped by kernel

The monitored box is the M160 (down state) 10.10.10.3  As I can see
there is nothing seen on the 224.0.0.5 from .4 ..  yet tcp seems to work
fine as you can see the BGP session is active.
 
> The "attempt" state is interesting. Does it really say that? The M20 
> is in 'init' state, so it is seeing the hello's from the M160. And so,

> the question is whether the M160 is receiving the hello packets and if

> it is rejecting them for some reasons.

Correction, "Attempt" only happens in un-numbered mode..  dead time
counts down to zero and it goes to "down"  From what I can tell its not
getting the packets.  Why I wonder.

The hello detail stuff on the M20 shows that .4 does indeed send hello
packets to 224.0.0.5:

Feb 22 21:19:46 OSPF sent Hello 10.10.10.4 -> 224.0.0.5 (ge-0/3/0.0, IFL
36)
Feb 22 21:19:46   Version 2, length 48, ID 10.20.30.42, area 0.0.0.0
Feb 22 21:19:46   checksum 0xffff, authtype 65535
Feb 22 21:19:46   mask 255.255.255.252, hello_ivl 10, opts 0x2, prio 128
Feb 22 21:19:46   dead_ivl 40, DR 1010.10.4, BDR 0.0.0.0

> My guess is that when you tried using ip addresses on the interfaces, 
> you can ping between the routers because the bgp session is working. 
> Are you using the GE ip addresses for your bgp endpoints? If you are 
> using the loopback addresses, they may not go through this GE link.

Correct iBGP peer to the localhost IP (router-id) did not work, makes
sense though there is no IGP on the M160. so this peer is setup direct
to the GE interface IP's

> Let me know what you find! I am quite sure there aren't any changes 
> between 5.6 and 6.2 in basic OSPF that may cause this problem but I'll

> set it up myself and verify that. Thanks.

Right, looking at the release notes I don't see anything shocking.

-Scotty

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