Re: BGP conditional adv??

Hi,
The advertise-map in aggregate address command is different from the
advertise map in conditional advertisements.
In aggregate address, the advertise-map argument is the "Name of the
route map used to select the routes to create AS_SET origin
communities"

With that said, I do NOT fully understand the scenario you're
describing. Please shed some more light.

On 2/25/10, Ivan Hrvatska <ivanzghr_at_gmail.com> wrote:
> Oh, yea. I didn't read carefully :) First bullet will be done by
> default. Third bullet will also be done by default. So, the second
> bullet is actually going through the task on reverse way. If 1.0.0.0
> is DOWN, nothing is going to be advertised, and if it is UP, only
> 2.0.0.0 will be advertised. OK. I get it. I was confused by the way
> the task is given.
>
> As I go further through the BGP i have one more issue.
> One task:
>
> R1------R2-------R3
>
> R3 has couple of specific nets which are aggregated by R2. R1 only
> gets aggregate prefix without atomic-agg attribute (summary-only and
> as-set is used). The aggregation should be configured such that R1 in
> AS 100 is the only AS that recivies agg route. R3 or future peer
> neighbors should NOT receive the agg route.
> Solution:
> ip as-path access-list 1 permit ^300$
> route-map TST per 10
> match as-path 1
> agg 3.1.0.0 255.255.240.0 as-set summ-only adv-map TST
>
> First, I planned to solve this task with community no-export. R2 sets
> that comm to the agg route and send it to R1.
> I don't het what this route-map exactly does in this case? as-path acl
> matches prefixes originated in AS 300. What else in combination with
> agg-add command?
>
> regards
>
> On Thu, Feb 25, 2010 at 11:20 AM, Tolulope Ogunsina <togunsina_at_gmail.com>
> wrote:
>> The solution means advertise 2.0.0.0 if (and only if) 1.0.0.0 exists
>> which also means if 1.0.0.0 does NOT exist, do NOT advertise 2.0.0.0.
>>
>> On 2/25/10, Ivan Hrvatska <ivanzghr_at_gmail.com> wrote:
>>> Yes, that is true. But shouldn't solution be: if 1.0.0.0/8 is DOWN, do
>>> NOT advertise 2.0.0.0:
>>>
>>> in solution in route-map EXIST you are matching 1.0.0.0, which means,
>>> if 1.0.0.0 exist in RIB, advertise what you permit in route-map ADV,
>>> and in route-map ADV you permit 2.0.0.0. That's what is confusing to
>>> me.
>>>
>>> On Thu, Feb 25, 2010 at 9:32 AM, Tolulope Ogunsina <togunsina_at_gmail.com>
>>> wrote:
>>>> Hi Ivan,
>>>> From the question,
>>>>
>>>> - if both nets 1.0.0.0 and 2.0.0.0 are up, R1 should advertise them both
>>>> - if 1.0.0.0/8 is DOWN, R1 should not advertise 2.0.0.0/8 to R3
>>>> - if 2.0.0.0/8 is DOWN, R1 should only advertise net 1.0.0.0/8 to R3
>>>>
>>>> network 2.0.0.0/8 is dependent on 1.0.0.0/8. (second requirement).
>>>> 1st and third requirements are the default behavior of the BGP process.
>>>>
>>>> Hence the solution only focuses on the second requirement.
>>>>
>>>> HTH,
>>>>
>>>> On 2/24/10, Ivan Hrvatska <ivanzghr_at_gmail.com> wrote:
>>>>> Hi experts,
>>>>>
>>>>> I have some difficulties to catch this scenario with BGP conditional
>>>>> adv:
>>>>>
>>>>> R1-----------R2
>>>>> |
>>>>> |
>>>>> R3
>>>>>
>>>>> R1 has lo0 1.1.1.1/8, R2 has Lo0 2.2.2.2/8 and R3 has also Lo0
>>>>> 3.3.3.3/8. All RTs are in same AS and all of them advertise their
>>>>> loopbacks.
>>>>> Task is next:
>>>>> - if both nets 1.0.0.0 and 2.0.0.0 are up, R1 should advertise them
>>>>> both
>>>>> - if 1.0.0.0/8 is DOWN, R1 should not advertise 2.0.0.0/8 to R3
>>>>> - if 2.0.0.0/8 is DOWN, R1 should only advertise net 1.0.0.0/8 to R3
>>>>>
>>>>> Solution on R1:
>>>>> acl 1 permit 1.0.0.0 0.255.255.255
>>>>> acl 2 permit 2.0.0.0 0.255.255.255
>>>>>
>>>>> route-map ADV per 10
>>>>> match ip add 2
>>>>> route-map EXIST per 10
>>>>> match ip add 1
>>>>>
>>>>> router bgp 100
>>>>> neighbor R3 adv-map ADV exist-map EXIST
>>>>>
>>>>> So, from my point of view this task should do next:
>>>>> - if 1.0.0.0/8 is UP (2.0.0.0/8 can also be UP) advertise 2.0.0.0/8 to
>>>>> R3 (task asks you to NOT advertise)
>>>>> - if 1.0.0.0/8 is DOWN (2.0.0.0/8 can also be DOWN), do not advertise
>>>>> anything
>>>>>
>>>>> This solution is correct, but I don't get the logic?
>>>>>
>>>>>
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>>>>>
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>>>>>
>>>>>
>>>>>
>>>>>
>>>>>
>>>>>
>>>>>
>>>>>
>>>>
>>>>
>>>> --
>>>> Best Regards,
>>>>
>>>> Tolulope.
>>>>
>>>
>>
>>
>> --
>> Best Regards,
>>
>> Tolulope.
>
>
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-- 
Best Regards,
Tolulope.
Blogs and organic groups at http://www.ccie.net