[c-nsp] Different behaviour for static route on different IOS?

[Rey Martin]

ok now Im curious how the recursive routing can affect load balancing over 
multiple connection?
any example?
but Im agree that it could cause some unexpected behaviour.


----- Original Message ----- 
From: "Hyunseog Ryu" <r.hyunseog at ieee.org>
To: <chooweikeong at pacific.net.sg>
Cc: <cisco-nsp at puck.nether.net>
Sent: Tuesday, February 15, 2005 1:00 PM
Subject: Re: [c-nsp] Different behaviour for static route on different IOS?


>I believe I had same issue around that version.
> Cisco started to implement recursive lookup for next hop,
> so load balancing over multiple connections didn't work.
> Therefore since then, using interface name was mandatory solution.
> I've been spent a lot of time with Cisco TAC, and they had no clue.
>
> Hyun
>
>
> chooweikeong at pacific.net.sg wrote:
>> Hi All,
>>
>> Realise that there is a different behaviour for static route (next-hop to
>> an interface ip) on IOS 12.3 and 12.0.
>>
>> As shown below, i've a static route next-hop to an interface ip, and the
>> interface has been shutdown. For 12.0, the static route is not active, 
>> but
>> for 12.3, the static route is active, even though the interface is down.
>>
>> Is this a 'new' feature? Since when is this feature introduced?
>>
>> Appreciate your feedback.
>>
>> Thanks,
>> Wei Keong
>>
>>
>> IOS Ver 12.3(10)
>> ----------------
>>
>> Serial5/0.1/1/3/1:8   192.168.16.49  YES manual administratively down 
>> down
>>
>> ip route 10.0.200.120 255.255.255.252 192.168.16.50
>>
>>
>>
>>>sh ip route 10.0.200.120
>>
>> Routing entry for 10.0.200.120/30
>>    Known via "static", distance 1, metric 0
>>    Redistributing via ospf 10
>>    Advertised by ospf 10 subnets
>>    Routing Descriptor Blocks:
>>    * 192.168.16.50
>>        Route metric is 0, traffic share count is 1
>>
>>
>>
>>>sh ip route 192.168.16.50
>>
>> Routing entry for 192.168.16.0/21, supernet
>>    Known via "ospf 10", distance 110, metric 20, type extern 2, forward 
>> metric 1
>>    Last update from 10.9.1.6 on GigabitEthernet0/1, 6d22h ago
>>    Routing Descriptor Blocks:
>>    * 10.9.1.6, from 192.168.3.6, 6d22h ago, via GigabitEthernet0/1
>>        Route metric is 20, traffic share count is 1
>>
>>
>> IOS Ver 12.0(22)
>> ----------------
>> Serial6/3             192.168.16.49  YES manual administratively down 
>> down
>>
>> ip route 10.0.200.120 255.255.255.252 192.168.16.50
>>
>>
>>>sh ip route 10.0.200.120
>>
>> % Subnet not in table
>>
>>
>>>sh ip route 192.168.16.50
>>
>> Routing entry for 192.168.16.0/21, supernet
>>    Known via "ospf 10", distance 110, metric 20, type extern 2, forward 
>> metric 1
>>    Last update from 10.9.1.6 on GigabitEthernet0/3, 6d22h ago
>>    Routing Descriptor Blocks:
>>    * 10.9.1.6, from 192.168.3.6, 6d22h ago, via GigabitEthernet0/3
>>        Route metric is 20, traffic share count is 1
>>
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>
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