11-05-2007 03:44 AM - edited 03-03-2019 07:24 PM
Hi
I have a serial link between 2 routers running HDLC. The DTE router shows me
Available Bandwidth 1 kilobits/sec
And the DCE router shows me
Available Bandwidth 192 kilobits/sec
Am I correct by saying the clock rate must be set on the router? If this is the case, which router must be configured the DTE or DCE router?
Thanks
willemvw
11-05-2007 04:39 AM
The clock rate must be set on the DCE router. That is, assuming you are using a DTE-DCE back-to-back cable. You can confirm the cable by doing a show controllers for the interface at each end of the link.
However, the parameter you are observing is related to the configured "bandwidth", which is not directly related to the clock rate. In fact, the "Available bandwidth" is usually 3/4 of the configured bandwidth for the interface.
Which makes me wonder how you have 1 kbps on the DTE side. Can you post a show run int for each side?
Kevin Dorrell
Luxembourg
11-06-2007 04:29 AM
Hi Kevin
Below is the output for the interfaces of the 2 routers:
RT_01#sh run int s0/2/0
Building configuration...
Current configuration : 241 bytes
!
interface Serial0/2/0
description 256K Connect to RT_02
bandwidth 256
ip address 172.16.16.1 255.255.248.0
no ip route-cache cef
no ip route-cache
no ip mroute-cache
load-interval 30
compress stac
end
RT_01#
RT_02#sh run int s0/2/0
Building configuration...
Current configuration : 266 bytes
!
interface Serial0/2/0
description 256K Connect to RT_01
bandwidth 256
ip address 172.16.16.2 255.255.248.0
ip mtu 256
no ip route-cache cef
no ip route-cache
no ip mroute-cache
compress stac
service-policy output WAN-QoS
end
RT_02#
Thanks
willemvw
11-06-2007 04:39 AM
The service policy on RT_02 has probably claimed a part of the bandwidth, which is why the available bandwidth displays a lower value.
As Kevin stated, the router keeps a certain amount of bandwidth (approx 75%) for system use (routing protocols etc)
You can modify this default with the following command:
max-reserved-bandwidth
regards,
Leo
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