Bandwitdh settings

[globalonline]

By looking at my config below, could someone tell me what the bandwith is actually set at on serial inter.0/0. What I really need to know is inter. ser.0/0.300 (point-to-point) to Tucker, GA is it actually running at 256k as set (I'm paying for 384k).

**********************************

!

interface Serial0/0

description 512Kb/256k (DHEC.639861/ATT) DLCI 209

bandwidth 512

no ip address

no ip directed-broadcast

encapsulation frame-relay

no ip mroute-cache

no fair-queue

!

interface Serial0/0.200 point-to-point

description 128k (DEEC.814450/ATT) DLCI 209 to DLCI 200 (62ms)

bandwidth 128000

ip address 172.19.2.82 255.255.255.252

ip directed-broadcast

ip accounting output-packets

frame-relay interface-dlci 200

!

interface Serial0/0.300 point-to-point

description 256k (DEEC.814450/ATT) to Tucker, GA DLCI 300 (62ms)

bandwidth 256000

ip address 172.19.101.30 255.255.255.252

ip directed-broadcast

ip accounting output-packets

frame-relay interface-dlci 300

!

interface Serial0/0.999 point-to-point

description Loc-mgmt PVC from router to Paradyne 9124 SLV

ip address 172.19.5.181 255.255.255.252

no ip directed-broadcast

frame-relay interface-dlci 999

!

[MickPhelps]

You can't determine the actual bandwidth from the configuration (unless you're traffic shaping). The BANDWIDTH directive is only useful to routing protocols to determine best path, or show int to display utilization as compared to the BW setting.

Mick.

[mmikhail]

Another note by the way, the bandwidth command is in Kbps. So, your counters are configured for 256Mbps this way!

The only effect of it is on the denominator of traffic ratios. Also some routing protocols can use it as a metric calculation factor.

[ramesh.krishnan]

hi,

the bandwidth command doesn't idicate or control bandwidth. the command is only for routing protocols to understand the capacity of the link.

thanks,

Ramesh

[mikchung]

From your router config, your Frame Relay connection is probably using Cisco LMI. You can use the command: show frame-relay lmi to confirm.

If Cisco LMI is being used, then you can use the command: show frame-relay map to show the mapping of DLCIs to sub-interfaces, the bandwidth of CIR of each PVCs will also be shown.

[jailbird]

Your main interface serial0/0 is described as 512K burst rate, 256K comitted rate. The actual bandwidth 512 setting is purely for statistical analysis purposes, and not a measure of actual bandwidth. All that happens when you change this is that stats are distorted.

Your subinterfaces 0/0.200 and 0/0.300 total 384K, but again this is only for stat analysis. All of these interfaces will send as much data as they can, and the bandwidth provided will restrict that.

The only way you can tell what actual bandwidth you have available is to use something like Solarwinds WAN killer, which sends traffic until your link stops, then reports the maximum bandwidth available.

Try www.solarwinds.net for an evaluation version; I think you will need the engineer version, which is 113Mb! Check the features on each version to be sure.