Re: EIGRP with HSRP Question.

If I read JB correctly, he is trying to have simetrical in/out paths
via a pair of border routers/switches.
Problem is... HSRP has no easy way to be linked to the L3 control plane.
In other words, it is not easy to let the outside (WAN) router know
which is your current active HSRP router. I've long wished there was an
HSRP track of sorts. But now one can be made with EEM.

-Carlos

marc abel @ 08/02/2013 02:58 -0300 dixit:
> The fact that the metrics are the same shows that the hops, bandwidth, and
> delay are the same, so you aren't introducing anymore more latency by
> selecting either route. In fact you may be better off letting the router
> remain on the link that is NOT your HSRP primary because then you won't be
> competing with your user traffic as much. Another option would be to turn
> on equal cost load balancing so it can use both paths. The default should
> be 4 equal paths. You can change this with "maximum-paths" under the eigrp
> process.
>
> If you are sure you want to make it prefer the other path you can do this
> by influencing the metric by changing the bandwith or delay on the link, or
> using an offset list to make one more or less desirable. Changing the
> bandwidth or delay don't actually affect link performance, just the metric
> they use to determine which path is more desirable.
>
>
> On Thu, Feb 7, 2013 at 11:29 PM, JB Poplawski <jb.poplawski_at_gmail.com>wrote:
>
>> Routing entry for 192.168.0.0/8
>> Known via "eigrp 100", distance 170, metric 51456, type external
>> Redistributing via eigrp 100
>> Last update from 192.168.1.2 on GigabitEthernet0/1, 06:14:27 ago
>> Routing Descriptor Blocks:
>> * 192.168.1.3, from 192.168.1.3, 06:14:27 ago, via GigabitEthernet0/1
>> Route metric is 51456, traffic share count is 1
>> Total delay is 1010 microseconds, minimum bandwidth is 100000 Kbit
>> Reliability 255/255, minimum MTU 1492 bytes
>> Loading 1/255, Hops 1
>> 192.168.1.2, from 192.168.1.2, 06:14:27 ago, via GigabitEthernet0/1
>> Route metric is 51456, traffic share count is 1
>> Total delay is 1010 microseconds, minimum bandwidth is 100000 Kbit
>> Reliability 255/255, minimum MTU 1492 bytes
>> Loading 1/255, Hops 1
>>
>>
>> On Thu, Feb 7, 2013 at 11:13 PM, marc edwards <renorider_at_gmail.com> wrote:
>>
>>> Longest prefix match always wins. Remove summary to reveal more
>>> specific routes. Could be that simple or as complicated as you want to
>>> make it.
>>>
>>> Regards,
>>>
>>> Marc
>>>
>>> On Thu, Feb 7, 2013 at 8:00 PM, JB Poplawski <jb.poplawski_at_gmail.com>
>>> wrote:
>>>> Both core routers/switches advertise the same subnet. WAN Router sees
>>> both
>>>> routes, but prefers the higher IP (or so it seems).
>>>>
>>>> If I had 5 routers, highest IP wins, right? If that's the case, I need
>>> to
>>>> get my primary HSRP/STP Switch to have the higher IP in the group.
>>>>
>>>> Trying to avoid any latency or additional hop in this solution.
>>>>
>>>>
>>>> On Thu, Feb 7, 2013 at 9:41 PM, marc edwards <renorider_at_gmail.com>
>>> wrote:
>>>>>
>>>>> Take advertisement off R1 and let it advertise all specific subnets in
>>>>> 192.168. Hard to say what without knowing what is attempting to be
>>>>> accomplished. When you say Router 2 leads the pack, I assume that this
>>>>> is from the view of your WAN router?Again without knowing exactly what
>>>>> is trying to be accomplished, if this is for lab or real design makes
>>>>> it tough to validate any decisions. But I can guarantee that longest
>>>>> prefix match will be the #1 routing selection and easiest to change by
>>>>> simply removing R1's summary.
>>>>>
>>>>> Regards,
>>>>>
>>>>> Marc
>>>>>
>>>>> On Thu, Feb 7, 2013 at 4:26 PM, Johnny Morris <
>> johnnymorris01_at_gmail.com
>>>>
>>>>> wrote:
>>>>>> What is your IGP ? You wouldn't necessarily mess with HSRP to
>>> influence
>>>>>> an
>>>>>> outbound route to a neighbor, You can use an offset-list for example
>>>>>> with
>>>>>> EIGRP on the two routers facing the 3rd router and reference an ACL
>>> with
>>>>>> the redistributed static route going to your third router. I would
>>> look
>>>>>> at
>>>>>> the metric that is being received from both routers and offset it
>>>>>> depending
>>>>>> on your IGP or routing protocol. For example of the route was
>> received
>>>>>> with
>>>>>> the same metric and you had two routes to get to the network you
>> could
>>>>>> do
>>>>>> the following with eigrp:
>>>>>>
>>>>>> An example would be
>>>>>>
>>>>>> R1
>>>>>>
>>>>>> router eigrp 1
>>>>>>
>>>>>> red static
>>>>>>
>>>>>> Offset- list 1 out 132000 INTERFACE
>>>>>>
>>>>>> access-list 1 p 192.168.0.0
>>>>>>
>>>>>> ip route 192.168.0.0 255.255.0.0 x.x.x.x
>>>>>>
>>>>>>
>>>>>> R2
>>>>>>
>>>>>> router eigrp 1
>>>>>>
>>>>>> red static
>>>>>>
>>>>>> Offset- list 1 out 132500 INTERFACE
>>>>>>
>>>>>> access-list 1 p 192.168.0.0
>>>>>>
>>>>>> ip route 192.168.0.0 255.255.0.0 x.x.x.x
>>>>>>
>>>>>>
>>>>>> Again depends on your routing protocol you are running between the
>>>>>> routers,
>>>>>> because you mentioned Variance I assume you are running EIGRP.
>>>>>>
>>>>>>
>>>>>> On Feb 7, 2013 6:23 PM, "JB Poplawski" <jb.poplawski_at_gmail.com>
>>> wrote:
>>>>>>
>>>>>>> Good afternoon,
>>>>>>>
>>>>>>> Have a scenario, it might be nit-picky, but figured I should ask.
>>>>>>>
>>>>>>> I have two routers running HSRP
>>>>>>> HSRP VIP - 192.168.1.1
>>>>>>> Router 1 Active - 192.168.1.2
>>>>>>> Router 2 Standby - 192.168.1.3
>>>>>>>
>>>>>>> Both routers are redistributing static for a network summary.
>>>>>>> 192.168.0.0/16
>>>>>>>
>>>>>>> I have an additional WAN router that comes in and is on that same
>>> Layer
>>>>>>> 3
>>>>>>> subnet.
>>>>>>>
>>>>>>> WAN - 192.168.1.10
>>>>>>>
>>>>>>> If I do a show ip route 192.168.0.0, I see both routers advertising
>>> the
>>>>>>> summary, Router 2 is leading the pack for who owns that route. My
>>>>>>> Router 1
>>>>>>> is both the VIP holder AND STP root, though.
>>>>>>>
>>>>>>> What am I doing wrong? I assume I can add distance statement and
>>> drop
>>>>>>> the
>>>>>>> standby down a peg or two. Are there any cleaner ways? Drop
>>> variance
>>>>>>> down?Any help is greatly appreciated.
>>>>>>>
>>>>>>> Regards,
>>>>>>> JB
>>>>>>>
>>>>>>>
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>>>>>>>
>>>>>>>
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-- 
Carlos G Mendioroz  <tron_at_huapi.ba.ar>  LW7 EQI  Argentina
Blogs and organic groups at http://www.ccie.net