[mrtg] Re: Query on OID for BRI Interfaces in Cisco Router

[Daniel J McDonald]

> Can anyone tell me the way to monitor Bri interfaces!!
> I have a problem with identifying the OId instance for the bri interfaces
in cisco router.
> Please refer to the output of the snmpwalk on ifDescr on a cisco router
with BRI interface.
>
> snmpwalk 192.168.20.1 public  ifDescr
You probably also want to perform a walk of ifType
> interfaces.ifTable.ifEntry.ifDescr.3 = BRI0/0
type 77, signaling - digits sent for dialing, keepalives, etc.

> interfaces.ifTable.ifEntry.ifDescr.4 = BRI0/0:1
type 23, traffic that has moved on channel 1

> interfaces.ifTable.ifEntry.ifDescr.5 = BRI0/0:2
type 23, traffic that has moved on channel 2

> interfaces.ifTable.ifEntry.ifDescr.12 = BRI0/0
type 76, mainly useful to see if the port is receiving power. (Layer 1
status).  No traffic counters.

> interfaces.ifTable.ifEntry.ifDescr.13 = BRI0/0
type 63, mainly useful to see if the port is talking to the switch (Layer 2
status).  There are traffic counters, but I'm not certain what they are
counting (SABME, maybe?)

> interfaces.ifTable.ifEntry.ifDescr.14 = BRI0/0:1
type 81, used to figure out when a call is in progress. no traffic counters

> interfaces.ifTable.ifEntry.ifDescr.15 = BRI0/0:2
type 81, used to figure out when a call is in progress. no traffic counters

I see you are not running ppp multi-link, or you would also have:

interfaces.ifTable.ifEntry.ifDescr.21 = "Virtual-Access1"
type 23, total traffic between the two bearer channels.


> Now my problem is identifying the correct instance out of this to monitor
the traffic.

If you can run ppp multilink, then monitor the virtual access interface.
If you can't run ppp multilink, then add the two type 23 interfaces together
to get the aggregate traffic.

Daniel J McDonald, CCIE 2495, CNX
Principal Network Specialist
Digicon Technologies
http://www.digicontech.com

Digicon, a Cisco Partner, Silver Certified.


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