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Wired Networking

Wired network service

Sutardja Dai Hall switch updates

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We’ve experienced unexpected blade reboots and multicast errors on some of the new switches in Sutardja Dai Hall. Per the vendor’s suggestion, I’ll be upgrading these to a newer software release.

Subnets Affected:
128.32.156.0/24, 128.32.247.0/25, 169.229.14.0/24, 169.229.222.0/23

The code revisions are close, so we expect to be able to perform a hitless upgrade; there should be no perceivable disruption. Nevertheless, I’m scheduling a 45 minute maintenance window (1715-1800) in case of problems.
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network maintenance for BWRC network

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We will upgrade the new image code for two BWRC switches on this Thursday May 14,2009. There will be brief network outages from 7:00AM to 7:10AM.

This will affect users who use wired connection in the BWRC lab and some machines that are connected to summit226-1 switch. Wireless in BWRC will not be affected. This upgrade should take less than 2 mins.

We regret any inconvenience this may cause. Please make your plans accordingly.

Resolved as of 2009-05-14 07:03:00

Planned Sutardja Dai Hall electrical shutdown

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There will be a temporary shutdown of power on Sat May 2, from 8am to noon to verify Building Automation Function with loss of power.

All network equipment, including wireless, should run on UPS and then emergency power once the main generator kicks in. While we expect no problems, this is the first operational test of the network UPSs.

(Note: All switches successfully remained online over the weekend. May 4, 0900.)

Resolved as of 2009-05-02 12:00:00

Router Maintenance

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As a followup to the network disruption Friday afternoon, I’ll be retesting the primary Cory Hall 10Gb module, and will reconnect the secondary links which were disabled Friday.

I anticipate no service disruption, but because the line card is suspect, and there is potential for problems, this work is scheduled for very early in the morning.

Unfortunately some of the problems we initially diagnosed as part of the routing troubles turned out to be server misconfiguration.
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Network routing & DNS disruptions

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We experienced several related network disruptions Friday afternoon. Beginning with reports at noon of DNS outages from Sutardja Dai Hall, there initially appeared to be problems with that building’s router failing to forward packets correctly. Resetting the links to the DNS service switches initially appeared to solve the issue, but additional connectivity problems between Cory and S-D were discovered later.

While following error messages generated by the primary 10Gb line card in the Cory Hall router, some wired subnets in Cory were temporarily isolated from the rest of the network and the Internet. This outage from 4:20-4:30pm occurred when the suspect line card failed to resume forwarding traffic after running diagnostics. Network staff were immediately aware of that disruption and quickly reestablished basic connectivity on a different port.

While the symptoms have been mitigated, the root cause of the outage has not been fully diagnosed and network is running without full redundancy. Network personnel are planning followup work and are actively monitoring this problem in the event that it reoccurs.
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