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LoDo
Beginner

Wrong mac address from stack SG500?

Hi,

It's my connection scheme.

There is a routing problem between vlans if one of the devices connected to the unit 2.

Within the same vlan devices are available for each other.

stack4.jpg

If PC200 connected to Gi1/1/15

Sniff ICMP traffic on Gi1/1/15:

Icmp request from 192.168.112.1 to 192.168.101.200:

Src: 24:01:c7:08:02:49 (192.168.101.254),

Dst: b8:88:e3:0e:1a:da (192.168.101.200)

  Icmp replly from 192.168.101.200 to 192.168.112.1:

Src: b8:88:e3:0e:1a:da (192.168.101.200)

Dst: 24:01:c7:08:02:49 (192.168.101.254)

If PC200 connected to Gi2/1/15

Sniff ICMP traffic on Gi2/1/15:

Icmp request from 192.168.112.1 to 192.168.101.200:

Src: 24:01:c7:08:00:01 (192.168.101.254),

Dst: b8:88:e3:0e:1a:da (192.168.101.200)

Icmp replly from 192.168.101.200 to 192.168.112.1:

Src: b8:88:e3:0e:1a:da (192.168.101.200)

Dst: 24:01:c7:08:00:01 (192.168.101.254)

Where does this mac-address (24:01:c7:08:00:01) appear? In the arp table on PC200 it is none.

1 ACCEPTED SOLUTION

Accepted Solutions

Lodo, I believe this is a bug. Best I'd recommend is call the SBSC and make a case. I believe it is related to bug

CSCub82382

-Tom
Please mark answered for helpful posts

-Tom Please mark answered for helpful posts http://blogs.cisco.com/smallbusiness/

View solution in original post

18 REPLIES 18
Tom Watts
Advocate

Well, I'm guess you may be seeing a port MAC address.

Are you on the newest firmware?

-Tom
Please mark answered for helpful posts

-Tom Please mark answered for helpful posts http://blogs.cisco.com/smallbusiness/

Firmware version 1.3.5.58.

This address (24:01:c7:08:00:01) it is not in the mac-address table.

swcore#sh mac address-table address 24:01:c7:08:00:01

Aging time is 300 sec

  Vlan        Mac Address         Port       Type

-------- --------------------- ---------- ----------

swcore#sh mac address-table address 24:01:c7:08:02:49

Aging time is 300 sec

  Vlan        Mac Address         Port       Type

-------- --------------------- ---------- ----------

   1       24:01:c7:08:02:49       0         self 

Hi,

With firmware 1.3.0.62 the same problem.

If the interface Gi2/1/15 to down and up - the first two icmp request has a source MAC

24:01:c7:08:02:49, remaining request has a source MAC 24:01:c7:08:00:01.

#show stack

Unit Model Name     MAC Address       Software  Master   Unit No./       Status       Mode After Reboot

---- -------------- ----------------- --------- -------- --------------- ------

1    SG500-28       24:01:c7:08:02:49   1.3.0.62  Enabled         1,            master              Native

2    SG500-28       24:01:c7:08:02:2c   1.3.0.62  Enabled         2,            backup              Native                  

And I suspect from within the same VLAN the issue is not present. That would suggest the switch is incorrectly using the port MAC instead of the system MAC.

-Tom
Please mark answered for helpful posts

-Tom Please mark answered for helpful posts http://blogs.cisco.com/smallbusiness/

Yes, within one vlan such problems aren't present. In this case, the source mac address - real mac address of the computer from which icmp requests are sent.

If to ping from the switch, source mac address is 24:01:c7:08:02:49.

The mac address 24:01:c7:08:00:01appears if the icmp request is routed on the switch. Such situation for any port of  the stack unit 2.

LoDo
Beginner

Somebody has any ideas how to fix it?

Lodo, I believe this is a bug. Best I'd recommend is call the SBSC and make a case. I believe it is related to bug

CSCub82382

-Tom
Please mark answered for helpful posts

-Tom Please mark answered for helpful posts http://blogs.cisco.com/smallbusiness/

View solution in original post

I'm running into the same (or very similar) problem. The bug report Tom put up is locked. I'm going to give SBSC a ring, and see if they have a update.

TAC confirmed this bug. Fix will be in the next firmware version.
Today I received a beta version, but have not tested it yet.

All,

Firmware version 1.3.7.18 was released today.

- Marty

Yay :-)

Out of curiosity, is this the same as CSCub82382, or was that already fixed in a previous firmware? The bug report is restricted, so I can't see it myself.

danielj80,

CSCub82382: SG500 - device is malforming packets It appears that this was resolved in a previous firmware.

- Marty

Message was edited by: Martin Pyhala

Someone official may want to update

https://supportforums.cisco.com/thread/2141121 as it seems to be very similar, and this firmware may help some thread followers.

I just put the firmware on, but it didn't resolve my problem (MAC address announcements hopping between ports). I noticed the firmware release notes didn't claim to correct any defects. Is this bug corrected in today's firmware, or slated for a later one?