Ethernet Switches & Routers

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Occasional Contributor
Posts: 5
Registered: ‎05-29-2014

BigIron 15000 showing irregular MAC addresses

On our production BigIron 15000,  I noticed the MAC addresses while issueing the below command of sh int br...some of the MAC addrdesses are the same....why is this???

 

 

 

 I noticed the MAC addresses while issueing the beliow command of sh int br

 


Port Link State Dupl Speed Trunk Tag Priori MAC Name
1/1 Up Forward Full 1G None No level0 0004.80f7.a100 <----------------------------
1/2 Up Forward Full 1G None No level0 0004.80f7.a101 
1/3 Up Forward Full 1G None No level0 0004.80f7.a102 
1/5 Up Forward Full 1G 3 Yes level0 0004.80f7.a100  <----------------------------
1/6 Up Forward Full 1G 3 Yes level0 0004.80f7.a100  <----------------------------
1/7 Up Forward Full 1G None No level0 0004.80f7.a100  <----------------------------
1/8 DisabNone None None None No level0 0004.80f7.a107
2/2 Up Forward Full 1G None No level0 0004.80f7.a121 
2/3 Up Forward Full 1G None No level0 0004.80f7.a122 
2/5 Up Forward Full 1G 3 Yes level0 0004.80f7.a100  <----------------------------
2/6 Up Forward Full 1G 3 Yes level0 0004.80f7.a100  <----------------------------
2/8 Up Forward Full 1G None Yes level0 0004.80f7.a100  <----------------------------
3/1 Up Forward Full 100M None No level0 0004.80f7.a100 <----------------------------
3/2 Down None None None None No level0 0004.80f7.a100 <----------------------------
3/3 Up Forward Full 100M None No level0 0004.80f7.a100 <----------------------------
3/4 Up Forward Full 100M None No level0 0004.80f7.a100 <----------------------------
3/5 Down None None None None No level0 0004.80f7.a100 <----------------------------
3/6 Down None None None None No level0 0004.80f7.a100 <----------------------------
3/7 Down None None None None No level0 0004.80f7.a100 <----------------------------
3/8 Down None None None None No level0 0004.80f7.a100 <----------------------------
3/9 Down None None None None No level0 0004.80f7.a100 <----------------------------

 

I know sometimes lag ports or vrrp ports are bundled together, but here we have a wide variety of ports, some up, some down, showing the same MAC address.

 

SW: Version 08.0.01yT53 Copyright (c) 1996-2004 Foundry Networks, Inc.
Compiled on Mar 21 2012 at 11:41:00 labeled as B2R08001y
(3861487 bytes) from Primary B2R08001y.bin
HW: BigIron 15000 Router, V2(0104), SYSIF version 21, Serial #: Non-exist
==========================================================================
SL 1: J-BxGMR4 JetCore Management Module, SYSIF 2 (Mini GBIC), M4, STANDBY
Serial #: CH31032263
4096 KB BRAM, JetCore ASIC IGC version 49, BIA version 8a
32768 KB PRAM and 2M-Bit*1 CAM for IGC 0, version 0449
32768 KB PRAM and 2M-Bit*1 CAM for IGC 1, version 0449
==========================================================================

Broadcom
Posts: 44
Registered: ‎01-05-2012

Re: BigIron 15000 showing irregular MAC addresses

Your box is running routing code, for routing interfaces they all use the virtual mac borrowed from the lowest interface of the device, namely the ethernet 1/1, mac 0004.8017.a100.

 

for other interfaces such as e 1/2. e 1/3. e 1/8. e 2/2 and e 2/3, they are just bridged interfaces and not belonging to any ve interfaces, hence they use the hardware mac, the BIA ( burn-in address ).

 

You can check your config to validate.

 

 

Occasional Contributor
Posts: 5
Registered: ‎05-29-2014

Re: BigIron 15000 showing irregular MAC addresses

Thank you for your reply.

 

So are you saying the diff in the MACs is dependent on the fact if its a routed port or switchport?

Broadcom
Posts: 44
Registered: ‎01-05-2012

Re: BigIron 15000 showing irregular MAC addresses

yes, exactly.

 

All routed ports will have the same Virtual MAC

Switch ports use their own Burned In Address ( BIA )

 

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