How to determine the mac address of an ATM interface
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04-13-2015 07:28 AM - edited 03-07-2019 11:31 PM
Hi All,
I have a router with an SHDSL controller. I am doing some troubleshooting and there seems to be an ip address conflict on the layer 2 shdsl network.
I am trying to figure the mac address of my atm sub interface. An ip address is set on the controller.
interface ATM0/0/0.1 point-to-point
Does someone know the command for finding it?
sh arp does not show the interface itself.
Can you please help.
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04-13-2015 07:34 AM
Can you try -
"sh atm addresses"
Jon
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04-13-2015 07:37 AM
Invalid command
#sh atm ?
arp-server ATM ARP Server Table
bundle ATM bundle information
class-links ATM vc-class links
ilmi-configuration Display Top level ILMI
ilmi-status Display ATM Interface ILMI information
interface Interfaces and ATM information
map ATM static mapping
pvc ATM PVC information
route ATM route
traffic ATM statistics
vc ATM VC information
vp ATM VP information
The command is not available :(
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04-13-2015 07:44 AM
ATM doesn't use mac addresses at L2 ie. it used VPI/VCI pairs.
However some Cisco devices do derive ATM addresses from mac addresses so I thought this may be the issue.
What if you do "sh atm interface <interface>"
Jon
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04-13-2015 07:48 AM
sh atm interface atm 0/0/0
Interface ATM0/0/0:
AAL enabled: AAL5 , Maximum VCs: 23, Current VCCs: 3
VCIs per VPI: 256,
Max. Datagram Size: 4528
PLIM Type: GSHDSL - 512Kbps, Framing is Unknown,, TX clocking: LINE
2983405 input, 6491775 output, 96081793 IN fast, 112759109 OUT fast
Avail bw = 512
Config. is ACTIVE
Unfortunately, no.
Is there a way I could force a mac address manually on the atm interface?
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04-13-2015 08:56 AM
Don't know is the short answer.
What device are you using ?
Jon
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04-13-2015 08:58 AM
Can't find either.
It is a Cisco Router 2801 running 12.4.
