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06-25-2015 07:23 AM
06-25-2015 07:23 AM
Greetings,
I'm seeing the same MAC addresses on two interfaces (AA-00-04-00-03-04), which is not the native hardware MAC addresse of the interfaces ( should be 00-1C-C4-FC-D1-4F and 00-1C-C4-FC-D1-4E)
LANCP> SHOW CONFIGURATION MRMC LAN Configuration (24-JUN-2015 10:20:29.30): Parent or Device PrefCPU Medium/User Version Link Speed Duplex Auto BufSize MAC Address Type Description ------ ------- ----------- ------- ---- ----- ------ ---- ------- ---------------- ------------ ----------- EWA0 0 Ethernet X-99 Up 1000 Full Yes 1500 AA-00-04-00-03-04 UTP Merl5704 00-1C-C4-FC-D1-4F (default) EWB0 3 Ethernet X-99 Up 1000 Full Yes 1500 AA-00-04-00-03-04 UTP Merl5704 00-1C-C4-FC-D1-4E (default) LANCP>
OpenVMS 8.4
System: rx2660
TCPIP V5.7-13
Not in a cluster
Long story:
At a site I help manager, the on-site tech enabled the secondary interface and assigned it a unique IP address. This was to address disconnects he was seeing, though I don't believe this is really the right way forward. I do see some errors on the primary Ethernet interface. I think that the root cause is probably a bad switch or switch port.
I'm guessing that someone tried to configure something incorrectly (maybe failover, maybe some cluster setting?) and it was never a problem until the second Ethernet interface was configured.
I can't find any documented way to reset the Ethernet interfaces to their factory-assigned MAC address.
Any help would be appriciated.
Solved! Go to Solution.
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06-25-2015 07:39 AM - edited 06-25-2015 07:41 AM
06-25-2015 07:39 AM - edited 06-25-2015 07:41 AM
Re: Duplicate MAC addresses on two interfaces
Larry,
this MAC address AA-00-04-00-03-04 is the DECnet Phase IV MAC address of this node. The DECnet Phase IV node address of this node is 1.3 (verify with $ SHOW NETWORK).
You need to stop running the DECnet IV protocol on the interface, if you do not want it to change its MAC address to the DECnet Phase IV MAC address, when starting DECnet.
Assuming you're running DECnet-OSI, you need to change the following setting in
SYS$SYSROOT:[SYSMGR]NET$ROUTING_STARTUP.NCL
...
SET NODE 0 ROUTING CIRCUIT CSMACD-0 ENABLE PHASEIV ADDRESS = TRUE
...
Find out which CSMACD station is mapped to EWB0 by looking at
SYS$SYSROOT:[SYSMGR]NET$CSMACD_STARTUP.NCL
...
CREATE NODE 0 CSMA-CD STATION CSMACD-0 COMMUNICATION PORT = EWA
...
If you've found the CSMACD station number for the desired LAN interface, change PHASEIV ADDRESS = TRUE to FALSE and reboot.
Do NOT change this on ALL LAN interfaces, if you are using DECnet Phase IV communication with any other nodes.
Volker.
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06-25-2015 10:01 AM
06-25-2015 10:01 AM
SolutionDECnet Phase IV or DECnet with Phase IV compatibility is running on a network that's not VLAN'd or segmented. It's permissible to connect network segments via a DECnet router, but you can't directly connect two interfaces to the same VLAN or same segment. Either shut off DECnet on the secondary controller, or configure a VLAN or otherwise split the segments.
The DECnet Phase IV analog of the Phase V / DECnet-Plus / DECnet OSI commands that Volker references are:
$ RUN SYS$SYSTEM:NCP
NCP> SHOW KNOWN CIRCUIT CHAR
NCP> SET CIRC xyz-0 STATE OFF
NCP> SET LINE xyz-0 STATE OFF
NCP> DEFINE CIRC xyz-0 STATE OFF
NCP> DEFINE LINE xyz-0 STATE OFF
The first NCP command gives you the names of the circults you're going to need to pick from (xyz-0 is shown, yours will differ), and some general information, while the subsequent four commands disable the DECnet line (interface, physical widget) and circuit (DECnet virtual circuit) in the volatile (SET) and permanent (DEF) databases.
Related:
Intro to MAC addresses on OpenVMS
DECnet Troubleshooting (MAC address section)
IVADDR invalid media address (DECnet Phase IV address collision)
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06-25-2015 12:33 PM
06-25-2015 12:33 PM
Re: Duplicate MAC addresses on two interfaces
Thanks so much to Volker and Hoff, the NCP commands resolved the duplicate MAC addresses.
I know very little about DECNet. We rarely use it. We usually run DECnet Plus and this had Phase IV installed by a 3d party, so it was acting dfferently from the rest of our servers.
Thanks again. You guys rock!