From: Tim Chan (timanji@yahoo.com)
Date: Thu Oct 19 2006 - 00:32:23 ART
No, I was not able to find out why this is happening.
----- Original
Message ----
From: Nick Griffin <nick.jon.griffin@gmail.com>
To: Tim Chan
<timanji@yahoo.com>
Cc: ccielab@groupstudy.com
Sent: Wednesday, October 18,
2006 8:29:29 PM
Subject: Re: bgp dmzlink-bw verification
Tim, were you ever
to make sense out of this? I just did a similar
scenario and notice the same
thing. Anyone have an thoughts/suggestions?
R5#sh ip bgp 100.100.100.0
BGP
routing table entry for 100.100.100.0/24, version 15
Paths: (2 available,
best #1, table Default-IP-Routing-Table)
Multipath: eBGP iBGP
Not
advertised to any peer
900
192.168.75.7 from 192.168.75.7
(192.168.97.7)
Origin IGP, metric 0, localpref 100, valid, internal,
multipath, best
DMZ-Link Bw 12 kbytes
900
192.168.85.8 from
192.168.85.8 (192.168.98.8)
Origin IGP, metric 0, localpref 100, valid,
internal, multipath
DMZ-Link Bw 1 kbytes
R5#sh ip route
100.100.100.0
Routing entry for 100.100.100.0/24
Known via "bgp 1000",
distance 200, metric 0
Tag 900, type internal
Last update from
192.168.85.8 00:06:08 ago
Routing Descriptor Blocks:
192.168.75.7,
from 192.168.75.7, 00:06:08 ago
Route metric is 0, traffic share count
is 1
AS Hops 1
* 192.168.85.8, from 192.168.85.8, 00:06:08 ago
Route metric is 0, traffic share count is 12
AS Hops 1
On 10/17/06,
Tim Chan <timanji@yahoo.com> wrote:
Hi all,
I'm trying to understand the
output I'm getting when I configure "bgp
dmzlink-bw".
After my configuration
is done, I get the following output:
R2#sho ip bgp 0.0.0.0
BGP routing table
entry for 0.0.0.0/0, version 32
Paths: (2 available, best #2, table
Default-IP-Routing-Table)
Multipath: iBGP
Flag: 0x800
Advertised to non
peer-group peers:
145.1.245.5
100,
(Received from a RR-client)
145.1.245.5 from 145.1.245.5 (
150.1.5.5)
Origin IGP, metric 0, localpref 100,
valid, internal, multipath
DMZ-Link
Bw 1 kbytes
100, (Received from a
RR-client)
145.1.245.4 from
145.1.245.4 (150.1.4.4)
Origin IGP,
metric 0, localpref 100, valid,
internal, multipath, best
DMZ-Link Bw
1250 kbytes
You can see that the
route to R5 is 1kbps and R4 is 1250kbps.
So when I do a "show ip route", I
get the following:
R2#sho ip route 0.0.0.0
Routing entry for 0.0.0.0/0,
supernet
Known via "bgp 200", distance 200,
metric 0, candidate default path
Tag 100, type internal
Last update from
145.1.245.4 00:00:28 ago
Routing
Descriptor Blocks:
* 145.1.245.5, from
145.1.245.5, 00:00:28 ago
Route
metric is 0, traffic share count is 10
AS Hops 1
145.1.245.4, from
145.1.245.4, 00:00:28 ago
Route metric
is 0, traffic share count is 1
AS Hops 1
Note that I'm getting a traffic
share count of 10:1. Which looks
good, BUT, the 10 is
towards the slower
link, not the faster one. So normally
I would read this as, "For every
10
packets sent to R5, send 1 packet to R4."
But this makes no sense!
In looking
at the doccd, the output in the examples
follows what makes sense. The faster
links get the larger ratios.
http://www.cisco.com/univercd/cc/td/doc/product/software/ios122/122newft/122t
/122t2/ftbgplb.htm#wp1052316
This is from IE Vol2 Lab 6, task 4.9. And even
their verification output shows the same
10:1 favor over the slower link. Are
these outputs correct and I'm just reading it wrong?
(But then the doccd shows
otherwise)
Please advise...
-Tim
This archive was generated by hypermail 2.1.4 : Wed Nov 01 2006 - 07:29:06 ART