Hello,
@Chris2 wrote:
is it the case that if Gavin had run show ospf database extensive he would have seen his vlan 300 subnet in area 0 too?
Correct.
@Chris2 wrote:
in my case we want tagged routes to use vlan 300 in area 300 but those taged routes also need to be advertised to carrier the routers in area 0. if we enable ospf and make it passive in area 300 we loose the ability to tag,
You can only tag Type-5 or Type-7 routes in OSPF.
You cannot tag Type-1,2,3 OSPF routes. Type-4 routes/LSA are auto-created, so You cannot even configure them at will let alone tag.
This is OSPF protocol feature/limitation if You will.
When You ad
@Chris2 wrote:
This looks similar to the issue i am trying to understand, why a vlan is advertised over area x instead of over area y.
i've reread the posts here but i'm still not getting it.
Alex could you explain a little more as to why the vlan is seen as a summary in area 1 and not in area 0, or is it the case that if Gavin had run show ospf database extensive he would have seen his vlan 300 subnet in area 0 too?
in my case we want tagged routes to use vlan 300 in area 300 but those taged routes also need to be advertised to carrier the routers in area 0. if we enable ospf and make it passive in area 300 we loose the ability to tag, but the peer router routes to the subnet across area 300 instead of area 0 or via the carrier
would greatly appreciate any help.
Thanks
Chris
vertise "passive" interface subnet into OSPF, it is advertised as Type-1 in the same area or Type-3 in different area. No way to tag interface subnet like this, You have to export direct interface subnet route into OSPF to be able to add tag.
@Chris2 wrote:
but the peer router routes to the subnet across area 300 instead of area 0 or via the carrier
In the OSPF protocol spec, the route across same area is always preferred over route via different area. This is another protocol feature/limitation if You will. You might need to convince Your provider to configure OSPF sham links (RFC4577 section 4.2.7 ) to allow routing via provider core.
But if I were You, I'd stop tinkering with OSPF and migrate to BGP. You will get much more traffic engineering capabilities with BGP.
HTH
Thx
Alex