01-16-2009 01:35 PM - edited 03-04-2019 12:52 AM
I have a R7000 been neighbor witch a 3640 and like CPE a 2800 (Customer router, i dont have administration of this one)
sh version
Cisco Internetwork Operating System Software
IOS (tm) 3600 Software (C3640-IS-M), Version 12.1(19), RELEASE SOFTWARE (fc1)
Copyright (c) 1986-2003 by cisco Systems, Inc.
Compiled Mon 03-Mar-03 21:11 by kellythw
Image text-base: 0x60008940, data-base: 0x60EB2000
ROM: System Bootstrap, Version 11.1(20)AA2, EARLY DEPLOYMENT RELEASE SOFTWARE (fc1)
CPE(2800) uptime is 2 years, 11 weeks, 6 days, 5 hours, 8 minutes
System returned to ROM by reload at 13:07:15 ARG Thu Oct 26 2006
System restarted at 13:13:11 AR Thu Oct 26 2006
System image file is "flash:c3640-is-mz.121-19.bin"
cisco 3640 (R4700) processor (revision 0x00) with 49152K/16384K bytes of memory.
My problem is that i have the routing table continuisly updating on certain routes, the 50% aprox. I don't see logs of peer problems or big change's on the received prefixes
CPE(2800)#show ip bgp neighbors 161.190.x.x
BGP neighbor is 161.190.x.x, remote AS 13474, external link
Description: Router Cliente
BGP version 4, remote router ID 161.190.x.x
BGP state = Established, up for 1d06h
Last read 00:00:58, hold time is 180, keepalive interval is 60 seconds
Neighbor capabilities:
Route refresh: advertised and received(new)
Address family IPv4 Unicast: advertised and received
Received 1170614 messages, 0 notifications, 0 in queue
Sent 3783247 messages, 5 notifications, 0 in queue
Route refresh request: received 0, sent 0
Default minimum time between advertisement runs is 30 seconds
For address family: IPv4 Unicast
BGP table version 23064792, neighbor version 23064792
Index 1, Offset 0, Mask 0x2
Inbound soft reconfiguration allowed
NEXT_HOP is always this router
Inbound path policy configured
Outbound path policy configured
Route map for incoming advertisements is CLIENTE-IN
Route map for outgoing advertisements is CLIENTE-OUT
1 accepted prefixes consume 36 bytes
Prefix advertised 12031501, suppressed 530010, withdrawn 9837951
1 denied but saved prefixes consume 36 bytes
Number of NLRIs in the update sent: max 288, min 0
Connections established 42; dropped 41
Last reset 1d06h, due to Peer closed the session
What could the be the cause of the partial refresh of the routing table every one minute , reboot the router its a possible solution?
01-16-2009 01:48 PM
This usually happens when a router doesn't have enough memory to store all the prefixes sent, so at some point the connection is broken and the cycle repeats infinitely.
01-17-2009 04:48 PM
mmmm you`re probably right its there any table on this website with the specs of the routers.
Thanks.
01-17-2009 11:54 PM
Hello Juan,
you can use
sh proc mem | inc Free
sh ip bgp sum
it says how much memory is used by BGP
if you can do this on both ends you can see if the BGP table is too big as suggested by Paolo.
Hope to help
Giuseppe
01-18-2009 04:24 PM
Hi Giusepe:
I have apparently enough memory but the routing table it`s still refreshing
Total: 25825344, Used: 13343196, Free: 12482148
PID TTY Allocated Freed Holding Getbufs Retbufs Process
BGP router identifier 200.9.X.X, local AS number XXXX
BGP table version is 31758836, main routing table version 31758836
7338 network entries and 7344 paths using 976170 bytes of memory
390 BGP path attribute entries using 23400 bytes of memory
24 BGP rrinfo entries using 624 bytes of memory
304 BGP AS-PATH entries using 7760 bytes of memory
1 BGP community entries using 24 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
2 received paths for inbound soft reconfiguration
BGP activity 1717805/2199433 prefixes, 2224154/2216806 paths, scan interval 60 secs
SLDS.
01-19-2009 01:28 AM
Hi,
isn't there eBGP multihop involved wit a default route only?
The configuration guide says "The multihop session is not established if the only route to the multi-hop peer's address is the default route (0.0.0.0)."
But I remember a case the session was Up but the BGP table was refreshing every minute - exactly as in your case.
BR,
Milan
01-24-2009 12:07 PM
The problem was solved rebooting the box.
Thanks all.
01-24-2009 01:12 PM
Hello,
Its normal, Partial EBGP update should be exchanged every 30sec and every 5sec for IBGP.
Another way to have the updates manually done is by configuring BGP route refresh Capability.
HTH
Mohamed
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