Re: Conditional Advertise

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 20.2.2.2/32 exist.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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Received on Sat Aug 29 2009 - 17:57:53 ART