Commit f69d7851 authored by Robert Ricci's avatar Robert Ricci
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Notes on setting up Nortel switches, from Kevin Lahey at ISI/DETER

parent ea94022a
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#### Setting up a Nortel 5500-series switch as an experimental switch
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The Emulab snmpit support works for at least the Nortel 5500 series
switches; at DETER, we use 5510-48Ts and 5530-24Ts. Keith Sklower
of UCB wrote the actual code, and can provide suggestions about
which other Nortel switches will work with the snmpit code.
There are at least two different lines of switches with different SNMP
MIBs, so there are definitely some Nortel switches which will NOT
work. The switches that use the RAPID-CITY mib should be okay, including
the 8000-series switches, although they have not been tested.
Apparently, *none* of the Nortel switches that are provided as part
of IBM blade centers will work with the current code; if you're
interested in support, definitely contact Keith.
All of these commands are supposed to be typed from the command
line (use the "Command Line Interface" menu option). Make sure that
you go into "config term" mode to make the changes. We usually
leave our switches configured to come up with the menu, as there
are some common functions that are much easier to do from the menu.
#### Access to the switches
At DETER, we've had the switches lock up infrequently. When they
lock up, they require a power cycle to come back, and often have
managed to lose all or part of their configuration.
For this reason, we have permanent connections to the serial ports
on the switches from serial port servers, so that we can get in and
reset the configuration by hand. We also have the switches on power
controllers, so that we can power off the switches remotely.
#### Configuration
While I've set up Nortels at DETER several times, and they seem
to work just fine, I may have forgotten some of the details in my
rush to get things working. Here are my suggestions -- please
let me know what details I've forgotten!
You can ask us at DETER for our 300KB+ Nortel configuration files;
for obvious reasons, we don't include them here. Oh, yeah, and
we're running SW v4.2.1.005.
#### ToS bits
By default, the Nortels appear to set the *IP* ToS bits to zero
for most packets. To prevent this, turn off QoS on the switch
altogether. This make sense if we want the network to appear as
though the switch is a direct connection:
no qos if-assign port ALL
#### Spanning tree
I believe that both Keith and I just turned off STP via the menu
options, but from the command line it should go something like
this (YMMV):
interface FastEthernet ALL
spanning-tree port ALL learning disable
exit
#### Extra packets
As above, we also want to turn off all topology discovery packets,
which will otherwise interfere with idle detection:
no autotopology
#### IGMP packets
Make sure that multicast can be flooded around the switch correctly;
the Nortel documentation for this command is particularly cryptic,
but it works for us. Doing IGMP snooping apparently (as per Keith)
locked up our switches. Ugh.
vlan igmp unknown-mcast-no-flood disable
#### mac address aging
While we don't have this set at DETER right now, Keith recommended
turning off mac address aging, as per the various Cisco setup
suggestions. The Nortel maximum (as per Keith) is apparently
a million; there is no way to turn it off altogether.
mac-address-table aging-time 1000000
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