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

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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