Re: MPLS R&S %BGP-4-VPNV4NH_MASK:

Thanks i did find the same, in short.

In the mpls domain I was using /8 in loopback and ospf use it as a /32 in
the routing table. And I did do mpls ldp update source l0. All looked good,
but no traffic was passing. And this is why.

I did not read Narbiks Adv workbook blue print, so I did miss the loopback
config with /32 subnet mask, in the mpls domain. I have been
troubleshooting this hard.
I will not do this mistake again.

Thanks.
Den 1 feb 2012 01:35 skrev "Alberto Santos" <albertofsantos_at_gmail.com>:

>
> Hi Hasse,
>
> this is from Output Interpreter I hope this will help
>
> %BGP-4-VPNV4NH_MASK (x1): Nexthop %i may not be reachable from neigbor %s
> - not /32 mask
>
> Explanation: The router has sent a VPN4 route to an IBGP neighbor. The
> next-hop
> address is a loopback interface that does not have a /32 mask defined. In
> addition,
> the router uses an OSPF on this loopback, and the OSPF network type of
> this interface
> is loopback. OSPF advertises this address as a host route (with mask /32)
> regardless
> of what mask is configured. This conflicts with the Tag Distribution
> Protocol
> (TDP), which uses configured masks, so the TDP neighbors may not receive
> a tag
> for this route. As a result, connectivity could be lost between sites that
> belong
> to the same VPN.
>
> Recommended Action: Configure the loopback used as the next hop with a
> 32-bit
> IP host mask (/32), or configure the ip ospf network point-to-point
> command on
> this loopback.
>
>
> BR,
>
> Alberto
>
> On 31 January 2012 21:37, Hasse <eriksson.hans_at_gmail.com> wrote:
>
>> When running
>>
>> %BGP-4-VPNV4NH_MASK: Nexthop 3.3.3.3 may not be reachable from neigbor
>> 4.4.4.4 - not /32 mask
>>
>> When doing static redistribution into !address-family ipv4 vrf CA
>> what does it mean, I have not found any useful info.
>>
>> I am running
>>
>> CE---PE---P---PE---CE
>>
>> !
>> router bgp 65001
>> no bgp default ipv4-unicast
>> bgp log-neighbor-changes
>> neighbor 4.4.4.4 remote-as 65001
>> neighbor 4.4.4.4 update-source Loopback0
>> !
>> address-family vpnv4
>> neighbor 4.4.4.4 activate
>> neighbor 4.4.4.4 send-community extended
>> exit-address-family
>> !
>> address-family ipv4 vrf CA
>> redistribute static metric 2
>> no synchronization
>> exit-address-family
>>
>>
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Received on Wed Feb 01 2012 - 02:05:37 ART