If you're taking it off the air for the network changes, John, I'd go ahead and close the network down until the work has completed and then reopen it.



MPE will be looking for the IPs as it opens up.  I know you can see the MAC addresses in NETTOOL, but I don't think they're of any import other than informational and for DTC traffic.



Jack



-----Original Message-----

From: HP-3000 Systems Discussion [mailto:[log in to unmask]] On Behalf Of John MacLerran

Sent: Tuesday, November 12, 2013 12:07 PM

To: [log in to unmask]

Subject: [HP3000-L] Mpe: Does MPE Cache MAC address for gateways



Hi Folks,



I have a question regarding how MPE talks to neighbor IP gateways.



On Nov 26, our networking folks are going to refresh the hardware on our IP gateways. Here is the rundown of what will happen from our Telecommunications manager:



- The physical gateway will change, because the hardware is being replaced.

- The IP address and gateway address will not change.

- What will change is the MAC address of the gateway (different gateway hardware).



What, if anything, do I need to do on our MPE boxes to ensure that they will see the new hardware? Does MPE cache the MAC address of neighbor gateways anywhere? I was thinking I needed to restart networking services, but I wasn't sure if anything more will be needed.



In NMMGR, at path NETXPORT.NI.LAN1.INTERNET.ISUGW, we have the entry B 134.050 nnn.nnn  (where nnn.nnn is the IP address of our gateway - I didn't want to reveal it to the world).  In the IP Network Address column we have @, no IP mask, and 1 hops.



Platforms: 1 N4000 4x440, and 1 A400 1x110, both on MPE 7.5, POWERPATCH C7501 P6



Thoughts / Concerns?



Thank you very much!



John MacLerran

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