On Thu, 30 Sep 2010 14:13:11 +1000 Julien Goodwin <nanog@studio442.com.au> wrote:
On 30/09/10 13:42, Mark Smith wrote:
One of the large delays you see in OSPF is election of the designated router on multi-access links such as ethernets. As ethernet is being very commonly used for point-to-point non-edge links, you can eliminate that delay and also the corresponding network LSA by making OSPF treat the link as a point-to-point link e.g.
int ethernet0 ip ospf network point-to-point
If your implementation doesn't support point-to-point mode for an interface, point-to-multipoint mode on an ethernet would achieve something somewhat equivalent.
Do any implementations go point-to-point automatically if an ethernet has a /30 or /31 mask?
Don't know. If you want to see what interface model OSPF is using, on a Cisco you use show ip ospf interface <blah> The interface type for loopback interfaces can be a bit surprising and the consequences a bit unexpected if you're intentionally or otherwise not using a /32 prefix length on one. Regards, Mark.