Mailing List Archive: set MED only on empty

set MED only on empty

Sep 19, 2020, 8:52 AM

Post #1 of 4 (772 views)

Hello

I want to set MED (metric) only when the peer did not specify a MED value.
The idea being that peers that set MED have a reason for their choice, but
if no MED value is set, I am going to set it to MED=(latency_to_peer_in_ms
+ 1000). That way we will prefer the route with lowest latency.

But I can not figure out how to match on no MED value in a policy. There
must be a way to do this?

Thanks,

Baldur
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Re: set MED only on empty [ In reply to ]

listas at esds

Sep 19, 2020, 12:12 PM

Post #2 of 4 (771 views)

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Hi Baldur,

Try match metric, with some tests you can define empty (maybe zero?).

https://www.juniper.net/documentation/en_US/junos/topics/usage-guidelines/policy-configuring-match-conditions-in-routing-policy-terms.html

Regards.

Em sáb., 19 de set. de 2020 às 12:59, Baldur Norddahl <baldur@gigabit.dk>
escreveu:

> Hello
>
>
>
> I want to set MED (metric) only when the peer did not specify a MED value.
>
> The idea being that peers that set MED have a reason for their choice, but
>
> if no MED value is set, I am going to set it to MED=(latency_to_peer_in_ms
>
> + 1000). That way we will prefer the route with lowest latency.
>
>
>
> But I can not figure out how to match on no MED value in a policy. There
>
> must be a way to do this?
>
>
>
> Thanks,
>
>
>
> Baldur
>
> _______________________________________________
>
> juniper-nsp mailing list juniper-nsp@puck.nether.net
>
> https://puck.nether.net/mailman/listinfo/juniper-nsp
>
> --
Eduardo Schoedler
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Re: set MED only on empty [ In reply to ]

baldur at gigabit

Sep 19, 2020, 2:49 PM

Post #3 of 4 (771 views)

Permalink

Hello

Metric zero should work, I do not know why I did not think of that.

Thanks,

Baldur

Den lør. 19. sep. 2020 kl. 21.13 skrev Eduardo Schoedler <listas@esds.com.br
>:

> Hi Baldur,
>
> Try match metric, with some tests you can define empty (maybe zero?).
>
>
> https://www.juniper.net/documentation/en_US/junos/topics/usage-guidelines/policy-configuring-match-conditions-in-routing-policy-terms.html
>
>
>
> Regards.
>
>
> Em sáb., 19 de set. de 2020 às 12:59, Baldur Norddahl <baldur@gigabit.dk>
> escreveu:
>
>> Hello
>>
>>
>>
>> I want to set MED (metric) only when the peer did not specify a MED value.
>>
>> The idea being that peers that set MED have a reason for their choice, but
>>
>> if no MED value is set, I am going to set it to MED=(latency_to_peer_in_ms
>>
>> + 1000). That way we will prefer the route with lowest latency.
>>
>>
>>
>> But I can not figure out how to match on no MED value in a policy. There
>>
>> must be a way to do this?
>>
>>
>>
>> Thanks,
>>
>>
>>
>> Baldur
>>
>> _______________________________________________
>>
>> juniper-nsp mailing list juniper-nsp@puck.nether.net
>>
>> https://puck.nether.net/mailman/listinfo/juniper-nsp
>>
>> --
> Eduardo Schoedler
>
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Re: set MED only on empty [ In reply to ]

juniper-nsp at puck

Sep 20, 2020, 11:26 AM

Post #4 of 4 (765 views)

Permalink

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