[huawei-nsp] A Multi-VPN-Instance CE and DN bit

[Victor Sudakov]

Victor Sudakov wrote:
> 
> I've spent a futile day trying to understand why in the topology shown
> here: http://noc.sibptus.ru/~sudakov/MCE.PNG
> the CE has a certain prefix in its lsdb but not in the routing table.
> It was not being installed into the routing table because of the DN
> bit set by the PE announcing the prefix.
> 
> Now I know that the "vpn-instance-capability simple" on the CE makes
> it ignore the DN bit and install the route.
> 
> My question is, why is "vpn-instance-capability simple" not the
> default behavior? What is the worst case scenario in the topology
> above if it were the default?

Well, I've found the topic more or less covered in 
https://eminent-ccie.blogspot.com/2009/09/ospf-capability-vrf-lite-command-down.html
and
https://community.cisco.com/t5/routing/where-to-configure-the-quot-capability-vrf-lite-quot-on-ce-or-pe/td-p/2812305
though they are not about Huawei.

-- 
Victor Sudakov,  VAS4-RIPE, VAS47-RIPN
AS43859