I just tried setting up the vme0 port on a large stack of EX4200s. I assigned vme0.0 an IP address in our "legacy" Cisco network, and the port was reachable, but I presumed that packets from vme0 were getting routed back through the trunks on other interfaces in the stack via the routes found in the routing table, rather than egressing back though the vme0 port. The "legacy" and "new Juniper" networks are connected together at only one point, distant from the stack.
Since I did not see an option to set a default route on the vme0 port independently of the static routes in routing-options, I added a static route for the legacy subnet the vme0 port was on, and the whole stack went offline. (dhcpd died and dumped core as well.) So I rolled back (from the serial console) and all is OK. I am stiil looking through the logs trying to figure out what happened, most likely a spanning tree issue.
I have some general questions:
1) Do I have to consider spanning tree when attaching a vme or me interface to a network, i.e. does it send out BPDUs?
2) Do I have to consider routing issues on vme or me interfaces? I have my OSPF config set to:
export export-edgeroutes;
area 0.0.0.0 {
interface vlan.0 {
with
vlan {
default {
l3-interface vlan.0;
I.e. with the vme / me interface uncommitted to a VLAN, will it join the default vlan and start participating in OSPF?
3) Do vme0 and me0 basically behave identically to with respect to the above two questions?
Thanks,
-w