Cheshire Cat Computing

We monitor our cisco router , but it didn,t monitor sub interface below is configuration, it automaticaly put #(comment before line)
:
### Interface 28 >> Descr: 'Serial1/0:15' | Name: '' | Ip: '10.30.30.2' | Eth: '' ###

### The following interface is commented out because:

### * --ifref=name is not unique for this interface

#

# Target[192.168.255.65_28]: 28:readonlypasswd@192.168.255.34:

# SetEnv[192.168.255.65_28]: MRTG_INT_IP="10.30.30.2" MRTG_INT_DESCR="Serial1/0:15"

# MaxBytes[192.168.255.65_28]: 8000

# Title[192.168.255.65_28]: 28 -- yourdomain.com

# PageTop[192.168.255.65_28]: <H1>28 -- yourdomain.com</H1>

# <TABLE>

# <TR><TD>System:</TD> <TD>yourdomain.com in </TD></TR>

# <TR><TD>Maintainer:</TD> <TD></TD></TR>

# <TR><TD>Description:</TD><TD>Serial1/0:15 *****dialing to Karol bagh** </TD></TR>

# <TR><TD>ifType:</TD> <TD>Link Access Protocol D (LAPD) (77)</TD></TR>

# <TR><TD>ifName:</TD> <TD></TD></TR>

# <TR><TD>Max Speed:</TD> <TD>64.0 kbits/s</TD></TR>

# <TR><TD>Ip:</TD> <TD>10.30.30.2 ()</TD></TR>

# </TABLE>

_________________
Steve Shipway
UNIX Systems, ITSS, University of Auckland, NZ
Woe unto them that rise up early in the morning... -- Isaiah 5:11

_________________
Steve Shipway
UNIX Systems, ITSS, University of Auckland, NZ
Woe unto them that rise up early in the morning... -- Isaiah 5:11

There is a command you can use on cisco devices that will keep the interface indexes constant.
That however wont save you if you change or upgrade equipment.
the command is
snmp-server ifindex persist

I had this problem, I was using SNMPc for monitoring my network and other network engineers either kept changing subinterfaces or did a few IOS upgrades on the core routers and that usually meant reconfiguring all my interface status checks as well as re-running my mrtg config makers.
So I m using this command ever since and no worries.

The reference by name however remains an issue for me as well, i cant manage my bri interfaces because of it.
The question is can I change the reference the mrtg uses in order to avoid changing the entire config file?

e.g. can i change
Target[tralalainterface]: 4:xxxx@192.168.1.111:
to Target[tralalainterface]: bri1:xxxx@192.168.1.111:

or do i need to put this in a separate config file with the option
--ifref=inteface number (cant remember the option syntax, i ll have to look it up)

My guess is I have to put in the option and use the interface snmp index number.
Am I correct?