Re: Conditional Advertise

Hi Ahmed and All,

  Seems as per cisco documentation as pasted below looks like like matches
will be treated as OR .

"

Like matches in the same route map subblock are filtered with "or"
semantics. If any one match clause is matched in the entire route map
subblock, this match is treated as a successful match. Dissimilar match
clauses are filtered with "and" semantics. So dissimilar matches are
filtered logically. If the first set of conditions is not met, the second
match clause is filtered. This process continues until a match occurs or
there are no more match clauses. "

Regards

Anantha Subramanian Natarajan

On Sat, Aug 29, 2009 at 7:59 AM, Anantha Subramanian Natarajan <
anantha.natarajan_at_gravitant.com> wrote:

> Oh,I see..Got it and thanks
>
> Regards
> Anantha Subramanian Natarajan
>
> On Sat, Aug 29, 2009 at 7:57 AM, Ahmed Ejaz <aahmedejaz_at_gmail.com>wrote:
>
>> It just works when you shutdown the first interface i-e NET1 in your case
>> which matches the first prefix-list in the route-map. This is fine and I
>> tested it but the problem is when you shutdown the other interface it does
>> not work.
>>
>> Ahmed.
>>
>> On Sat, Aug 29, 2009 at 5:52 PM, Anantha Subramanian Natarajan <
>> anantha.natarajan_at_gravitant.com> wrote:
>>
>>> Hi Ahmed and All,
>>>
>>> I tried the below configuration and it seem working ...May be I
>>> misunderstood something ..Here by providing the topology below and the
>>> related config
>>>
>>>
>>> R2(172.16.2.2/30) ----- (172.16.2.1/30)R0(172.16.1.1/30) -----(
>>> 172.16.1.2/30)R1
>>>
>>> R2 BGP AS number is 400,R0 AS number is 100 and R1 AS number is 300
>>>
>>> R2 is advertising 192.168.1.0/24 ,While R0 is advertising 10.1.10/24 and
>>> 20.2.2.2/32.Configured R0 with an advertisemap mentioning to advertise
>>> 192.168.1.0/24 provoided only both 10.1.1.0/24 and 20.2.2.2/32exist.When shutdown
>>> 10.1.1.0/24,R1 is not able to see 192.168.1.0/24.Kindly see the below
>>> config
>>>
>>> *R2*
>>>
>>> router bgp 400
>>> no synchronization
>>> bgp log-neighbor-changes
>>> network 192.168.1.0
>>> neighbor 172.16.2.1 remote-as 100
>>> no auto-summary
>>> !
>>> interface Loopback10
>>> ip address 192.168.1.1 255.255.255.0
>>>
>>> *R0*
>>> **
>>> router bgp 100
>>> no synchronization
>>> bgp log-neighbor-changes
>>> network 10.1.1.0 mask 255.255.255.0
>>> network 20.2.2.2 mask 255.255.255.255
>>> network 192.168.10.0
>>> neighbor 172.16.1.2 remote-as 200
>>> neighbor 172.16.1.2 advertise-map ADVERTISE exist-map EXIST
>>> neighbor 172.16.2.2 remote-as 400
>>> no auto-summary
>>> !
>>> route-map ADVERTISE permit 10
>>> match ip address prefix-list NET3
>>> !
>>> route-map EXIST permit 10
>>> match ip address prefix-list NET1 NET2
>>> !
>>> ip prefix-list NET1 seq 5 permit 10.1.1.0/24
>>> !
>>> ip prefix-list NET2 seq 5 permit 20.2.2.2/32
>>> !
>>> ip prefix-list NET3 seq 5 permit 192.168.1.0/24
>>> !
>>> interface Loopback10
>>> ip address 10.1.1.1 255.255.255.0
>>> !
>>> interface Loopback20
>>> ip address 20.2.2.2 255.255.255.255
>>>
>>> *R1*
>>> **
>>> router bgp 200
>>> no synchronization
>>> bgp log-neighbor-changes
>>> neighbor 172.16.1.1 remote-as 100
>>> no auto-summary
>>>
>>> So when I shutdown loopback10 in R0,I stopped seeing 192.168.1.0/24advertised to R1.Am I missing something,kindly let me know
>>>
>>> Thanks
>>>
>>> Regards
>>> Anantha Subramanian Natarajan
>>> **
>>> **
>>> **
>>> **
>>>
>>>
>>>
>>>
>>>
>>> **
>>>
>>>
>>>
>>>
>>> On Sat, Aug 29, 2009 at 6:58 AM, Ahmed Ejaz <aahmedejaz_at_gmail.com>wrote:
>>>
>>>> I tried that and it does not work.
>>>>
>>>> Ahmed.
>>>>
>>>> On Sat, Aug 29, 2009 at 4:53 PM, Anantha Subramanian Natarajan <
>>>> anantha.natarajan_at_gravitant.com> wrote:
>>>>
>>>>> Hi Sugar Can,
>>>>>
>>>>> Can you try inside the route-map as below
>>>>>
>>>>> Match ip address prefix-list <prefix-list1><prefix-list2>
>>>>>
>>>>> I think whenever we specify the match criteria on same line ,it is an
>>>>> AND
>>>>> operation
>>>>>
>>>>> Regards
>>>>> Anantha Subramanian Natarajan
>>>>>
>>>>> On Sat, Aug 29, 2009 at 12:57 AM, Sagar Rane <sagar.ccie_at_gmail.com>
>>>>> wrote:
>>>>>
>>>>> > Hi All,
>>>>> >
>>>>> > I have requirement where, bgp should check its bgp routing table for
>>>>> two
>>>>> > routes eq (10.1.1.0/24 and 20.2.2.2/32) and only if both routes are
>>>>> > present,
>>>>> > it should originate a route advertisement of 192.168.10.0/24.
>>>>> >
>>>>> > I have tried advertise-map and exist map, but how can we used
>>>>> exist-map to
>>>>> > check both the routes at the same time?
>>>>> >
>>>>> > Anyway how we can meet this requirement please let me know.
>>>>> >
>>>>> > Regards,
>>>>> > Sagar
>>>>> >
>>>>> >
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>>>>> >
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Received on Sat Aug 29 2009 - 08:24:39 ART