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jmginer
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routing filter set-bgp-communities ASN 32bit bug/error

Tue Feb 20, 2018 7:03 pm

Hello,

on the DE-CIX, the way to dont export a advertisemend to one peer is doing a setting BGP communitie.

But I get error when I try to add a ASN 32bit on the set-bgp-communities parameter.

Is not detected as a ASN.
 
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shaoranrch
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Re: routing filter set-bgp-communities ASN 32bit bug/error

Tue Feb 20, 2018 7:11 pm

Hi,

RouterOS doesn't have extended communities support yet (aside from the ROUTE-TARGET type one for MPLS VPN). The set-bgp-community is only for 32 bits community, hence you can't add a 32 bit ASN in there, only 16 bits ones
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deathandtaxes
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Re: routing filter set-bgp-communities ASN 32bit bug/error

Thu Mar 08, 2018 5:49 pm

The workaround is to use a different community if the ASN is greater than 65535. This needs to be used on both sides, of course. Using the ASN as the first 16-bits of the community is not a requirement...An arbitrary number can be used there.

I'd really like to see this fixed, though.
 
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mrz
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Re: routing filter set-bgp-communities ASN 32bit bug/error

Thu Mar 08, 2018 6:03 pm

How do you expect it to be fixed? BGP communities are only 4bytes, so it is like trying to carry 2 litres of water in one litre bottle.

Only Extended communities can be used instead.

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