see in-line:
Jay Hennigan wrote: > sky vader wrote: >> Hi, >> >> Just curious, since the default bandwidth for tunnel interface is 9k >> (cisco platform), does that mean the maximum bandwidth I can have is 9k? > > No. ------------------------- So what does tunnel "bandwidth transmit / receive" statement under tunnel interface do? For example: interface tunnel0 bandwidth 40000 ip address 192.169.0.1 255.255.255.252 tunnel destination x.x.x.x tunnel bandwidth transmit 40000 tunnel bandwidth receive 40000 thanks, sky > >> What's the purpose of setting bandwidth statement on a tunnel interface? >> Does that mean I get bandwidth that is set or what the router will >> report via snmp? > > Three things come to mind, there are likely other subtle ones... > > 1. Dynamic routing protocols use the interface bandwidth for path > selection. Manually specifying the bandwidth to something sane for the > physical path over which the tunnel rides may be needed for proper route > selection. > > 2. MRTG and similar tools will use the configured bandwidth as the > default maximum for graphing and analysis purposes. Leaving it at 9K is > likely to result in graphs topped at that value. SNMP of the actual > traffic counts will be accurate, but configuration tools of graphing > software will get the configured bandwidth on setup and may behave as if > this is the physical limit. > > 3. QoS and traffic shaping applied to the interface will use the > configured bandwidth for percentage calculations and the like. This > will almost certainly cause results that aren't what you expect unless > the tunnel is running over a dialup link. > > If you are doing none of these, then the configured bandwidth statement > really doesn't affect anything in terms of operation that I've noticed. > > -- > Jay Hennigan - CCIE #7880 - Network Engineering - [email protected] > Impulse Internet Service - http://www.impulse.net/ > Your local telephone and internet company - 805 884-6323 - WB6RDV > _______________________________________________ cisco-nsp mailing list [email protected] https://puck.nether.net/mailman/listinfo/cisco-nsp archive at http://puck.nether.net/pipermail/cisco-nsp/
