IOS has options for med=0 vs med=max (not the actual syntax) that determines
how the lack of a MED is interpreted. JUNOS does not. If not mistaken, we
always consider no med as a MED of 0.
From:
http://www.cisco.com/en/US/products/sw/iosswrel/ps5187/products_command_refe rence_chapter09186a008017d026.html#1039367
bgp bestpath med missing-as-worst
To have Cisco IOS software consider a missing Multi Exit Discriminator (MED)
attribute in a path as having a value of infinity, making the path without a
MED value the least desirable path, use the bgp bestpath med
missing-as-worst command in router configuration mode. To return the router
to the default (assign a value of 0 to the missing MED), use the no form of
this command.
bgp bestpath med missing-as-worst
no bgp bestpath med missing-as-worst
Syntax Description
This command has no arguments or keywords.
Defaults
The software assigns a value of 0 to the missing MED, causing the path with
the missing MED attribute to be considered the best path.
Command Modes
Router configuration
Command History
> -----Original Message-----
> From: juniper-nsp-bounces@puck.nether.net
> [mailto:juniper-nsp-bounces@puck.nether.net] On Behalf Of Blaz Zupan
> Sent: Wednesday, December 03, 2003 9:35 AM
> To: juniper-nsp@puck.nether.net
> Subject: [j-nsp] MED
>
>
> If we have two otherwise equal routes, one without a MED and
> one with a MED set, which one is preferred? Is a route
> without a MED considered equal to a MED of 0, so any route
> with a MED will have a lower priority than a route without a
> MED? _______________________________________________
> juniper-nsp mailing list juniper-nsp@puck.nether.net
> http://puck.nether.net/mailman/listinfo/junipe> r-nsp
>