From: MD (ccievision@yahoo.com)
Date: Mon Jul 05 2004 - 03:18:10 GMT-3
FYI--Variance command did not help.
Let me explain the problem again. Router has 2 EIGRP processes 318 and 305. It is learning route 172.16.15.0 from both the AS with same metric(46738176/4622617).
AS318 from Serial 0(NBMA) and AS305 from Serial2(PtoP)
Here is the EIGRP topological database--See the difference in FD of both routes but same metric. IOS for some reason is increasing the FD for one route when it learns the same route from 2 EIGRP processes. Check this--when I shut down Serial2. see the change in FD. .
EIGRP TOPOLOGICAL DATABASE WHEN BOTH S0 and S2 are UP.
IP-EIGRP (AS 318): Topology entry for 172.16.15.0/28
State is Passive, Query origin flag is 1, 0 Successor(s), FD is 4294967295
Routing Descriptor Blocks:
172.16.123.1 (Serial0), from 172.16.123.1, Send flag is 0x0
Composite metric is (46738176/46226176), Route is Internal
Vector metric:
Minimum bandwidth is 56 Kbit
Total delay is 40000 microseconds
Reliability is 255/255
Load is 1/255
Minimum MTU is 1500
Hop count is 1
IP-EIGRP (AS 305): Topology entry for 172.16.15.0/28
State is Passive, Query origin flag is 1, 1 Successor(s), FD is 46738176
Routing Descriptor Blocks:
172.16.35.2 (Serial2), from 172.16.35.2, Send flag is 0x0
Composite metric is (46738176/46226176), Route is Internal
Vector metric:
Minimum bandwidth is 56 Kbit
Total delay is 40000 microseconds
Reliability is 255/255
Load is 1/255
Minimum MTU is 1500
SH IP ROUTE-- shows only one route
D 172.16.15.0/28 [90/46738176] via 172.16.35.2, 00:01:29, Serial2
EIGRP TOPOLOGICAL DATABASE WHEN S2 is SHUT DOWN
h ip eigrp topology 172.16.15.0 255.255.255.240
IP-EIGRP (AS 318): Topology entry for 172.16.15.0/28
State is Passive, Query origin flag is 1, 1 Successor(s), FD is 46738176
Routing Descriptor Blocks:
172.16.123.1 (Serial0), from 172.16.123.1, Send flag is 0x0
Composite metric is (46738176/46226176), Route is Internal
Vector metric:
Minimum bandwidth is 56 Kbit
Total delay is 40000 microseconds
Reliability is 255/255
Load is 1/255
Minimum MTU is 1500
Hop count is 1
% IP-EIGRP (AS 305): Route not in topology table
SH IP ROUTE- again shows only one route
D 172.16.15.0/28 [90/46738176] via 172.16.123.1, 00:00:07, Serial0
This tells me there is something in the IOS that prevents load balancing for a particular route over 2 different AS( Irrespective of being external or internal and despite having same Metric). Please confirm if you also think so , unless anybody has actually tried load balancing over 2 AS ???????????
thanks,
MD
Godswill Oletu <oletu@inbox.lv> wrote:
Set the AD of both routes to be the same. Check your EIGRP topological
database to make sure that both routes are in the topological database,
though it is only the best route that will be selected from the topological
database and installed in the routing table.
Note the metric values of both routes in the EIGRP topological database eg
if:
route 1 metric= 12313
route 2 metric= 35262
route 2 metric/route 1 metric = 2.86 = 3
To setup unqual load balance across both route 1 and route 2:
Under the EIGRP process, set variance = 3
This will make EIGRP to install both routes into the routing table and load
balance across both routes. A simple traceroute command will confirm the
load balance.
Godswill Oletu
===========
8,x$:0`0:$x,88,x$:0 In the future everything will Work :$x,88,x$:0`0:$x,8
----- Original Message -----
From: "MD"
To: ;
Sent: Sunday, July 04, 2004 10:36 PM
Subject: RE: Modifying AD for EIGRP external routes
> I tried using "distance eigrp 90 91 " command and it does maka the
external AD to 91 but here is another problem now.
>
> My objective was to test load balance 2 routes learned by internal EIGRP
and external EIGRP by making the AD and metric same for both routes. After
using the above command , I was able to make metric and AD same but now I
see that router is not doing load balancing between 2 routes which have same
metric and AD but instead prefer the internal Eigrp route.
>
> As a workaround , I even tried getting the external route as internal
route via different AS No. but then again the same problem. Router would not
do load balancing even though the metrics and AD are same because it is
learning routes from 2 different AS's.
>
> So my question is- Can you achieve load balancing for a particular route
learned from 2 different AS's and make the router shows both routes in the
routing table.
>
>
>
> thanks,
> MD
>
>
> Matt Hill wrote:
> Can you try running EIGRP in different ASes, with different ADs and
> doing redistribution?
>
> Matt
>
> --
> Matt Hill
> Network Engineering
> Alcatel Australia Pty Ltd
> 180-188 Burnley St
> Richmond, Vic
> 3121
>
> v: +61 3 8687 5739
> f: +61 3 8414 3115
> e: matt.hill@aapt.com.au
> u: http://www.alcatel.com.au
> m: ask and you may receive
>
> -----Original Message-----
> From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On Behalf Of
> ccievision@yahoo.com
> Sent: Monday, 5 July 2004 4:17 AM
> To: ccielab@groupstudy.com; security@groupstudy.com
> Subject: Re: Modifying AD for EIGRP external routes
>
> Thanks everyone for your input.
>
> I will try changing the AD for all EIGRP routes and then modify AD again
> at downstream routers to see if I can achieve my objective.
>
> Any other suggestions would also be appreciated.
>
> thanks,
> MD
> Richard Gallagher wrote:
> It is possible to change the distance for external routes, but you
> cannot
> change it for specific prefixes:
>
> http://www.cisco.com/en/US/products/sw/iosswrel/ps5207/products_command_
> reference_chapter09186a00801a807f.html#wp1075239
>
> router(config-router)#distance eigrp 90 ?
> <1-255> Distance for external routes
>
> router(config-router)#distance eigrp 90 171 ?
>
>
> HTH, Rich
>
> ----- Original Message -----
> From: "MD"
> To: ;
> Sent: Sunday, July 04, 2004 10:56 AM
> Subject: Modifying AD for EIGRP external routes
>
>
> > Has anybody tested reducing the AD of external EIGRP routes from 170
> to
> some other value (say 91).
> >
> > I have tried the distance command under EIGRP but it changes the
> distance
> only for internal eigrp routes and not external eigrp routes.
> >
> > Here is the relevant configs...
> >
> >
> > router eigrp 318
> > redistribute eigrp 300 route-map 300to318
> > offset-list 99 in 20 Serial0
> > network 172.16.123.0 0.0.0.31
> > neighbor 172.16.123.1 Serial0
> > neighbor 172.16.123.4 Serial0
> > distance 91 172.16.123.1 0.0.0.0 98
> > distance 91 172.16.123.4 0.0.0.0 97
> > no auto-summary
> > !
> >
> > access-list 97 permit 10.2.4.0 0.0.3.255
> > access-list 98 permit 172.16.15.0 0.0.0.15
> >
> >
> > SH IP ROUTE
> >
> > D EX 172.16.15.0/28 [170/46738176] via 172.16.123.1, 00:00:07, Serial0
> > D 10.2.4.0/22 [91/46251776] via 172.16.123.4, 00:25:30, Serial0
> >
> >
> > FYI-- 172.16.123.1 is sending external EIGRP routes and 172.16.123.4
> is
> sending internal EIGRP routes and I am trying to make both these routee
> to
> show up with AD 91 in the routing table.
> >
> >
> > thanks,
> >
> > MD
> >
> >
> >
> >
> >
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