[j-nsp] Running OSPF to manage loopbacks, only have trunks

[Mark Tinka]

Basically, what we do is what Chris described.

In our case, we have Layer 2-only devices in two places in 
the network - core switching in the larger PoP's and egde 
switching for aggregating supporting services, e.g., DNS, 
mail, e.t.c.

For the core switches, we run an IP-aware VLAN and enable 
IS-IS on that. That exchanges routes with the core routers 
which then allow the devices to be visible across the entire 
IGP.

For the edge switches, those are attached to routers 
directly (802.1Q Trunking). On the switch, we run an IP-
aware VLAN that corresponds to a Management VLAN between the 
switch and its adjacent router. On the router, that 
interface is placed into IS-IS (passive mode) and the switch 
is now reachable across the entire IGP.

Has been a solid design since we started it, and it holds 
pretty nicely.

Like Chris, we standardize on the VLAN ID's to use at each 
PoP where this is necessary, as they are all locally 
significant to the switches.

We really don't like Layer 2 Ethernet switching protocols, 
and will replace them with IP as often as we can. If we have 
to use them, we localize them to within the same switch or 
no more than two.

Hope this helps.

Cheers,

Mark.
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