Jean-
Thanks. Many BGP implementations have the ability to do conditional
advertisements, where you announce (or don't) a set of prefixes based on
the presents (or absence) of other routes. I don't think quagga does
natively, and not sure if VyOS has added that on.
Conceptually, you want to be doing "announce these prefixes from this
router only if I don't see routes from the upstream on the other router".
The 'safest' way is probably to just monitor default, but it depends on
your environment.
On Fri, Dec 27, 2024 at 6:09 PM Jean Franco <jfra...@maila.inf.br> wrote:
> Hi Tom,
> This is exactly what I was planning.
> I'm announcing a block via ISP1 and another set of blocks via ISP2, and
> have iBGP running between them.
>
> Thanks a lot!!
>
> Best regards,
>
>
>
>
>
>
>
> On Fri, Dec 27, 2024 at 1:00 PM Tom Beecher <beec...@beecher.cc> wrote:
>
>> Jean-
>>
>> Yeah, don't worry about people complaining.
>>
>> Is this an accurate description of what you are trying to achieve?
>>
>> - Have 2 different sets of prefixes that you announce. Set A via
>> router1/ISP1 , Set B via router2/ISP2
>> - If BGP to one of your ISPs goes down, start announcing those prefixes
>> to the other ISP. ( Example, if ISP2 goes down, start announcing prefix Set
>> B over ISP1 )
>>
>> On Thu, Dec 26, 2024 at 8:16 AM Jean Franco <jfra...@maila.inf.br> wrote:
>>
>>> Hi guys,
>>> I've been on the list for as long as I cannot even remember.
>>> So just you know, I'm not new at this.
>>>
>>> This is no easy task, that's why I came here looking for help.
>>> I'm sorry if I brought anguish to the experts on the list!
>>> I thought I could bring something that someone may have
>>> experienced before.
>>>
>>> I haven't solved this yet, but at least I've received some
>>> valuable suggestions and I Thank you!
>>>
>>> About all the details of the connections, numbers of peerings, PNI's and
>>> IXP's I have left them out, since I figured this additional information
>>> could make things worse.
>>>
>>> ISP 1 <router01> ====20KM====<Router>====20KM====<router02> ISP2
>>>
>>> The ISP connections are all 10G.
>>> I don't believe these routers are DFZ capable.
>>> All the routers are well capable and already receive the full routes.
>>> The connections between these routers are 40G.
>>>
>>> Best regards,
>>>
>>>
>>> On Thu, Dec 26, 2024 at 12:53 AM Bryan Fields <br...@bryanfields.net>
>>> wrote:
>>>
>>>> On 12/25/24 6:18 PM, Randy Bush wrote:
>>>> > where does one go for is-is help? the mtu issie can be painful!!!
>>>>
>>>> I think here would be good too. I recently had to do this between a
>>>> Cisco
>>>> 3945e and a Juniper, and from my unrevised notes:
>>>>
>>>> vlan {
>>>> unit 405 {
>>>> family iso {
>>>> # holy shit this is important. CISCO and Juniper will not talk
>>>> unless the
>>>> MTU is set
>>>> mtu 1492;
>>>> }
>>>> }
>>>> }
>>>>
>>>> :-)
>>>>
>>>> --
>>>> Bryan Fields
>>>>
>>>> 727-409-1194 - Voice
>>>> http://bryanfields.net
>>>>
>>>
