Nortel 5000, Release Notes

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44 Known issues and limitations
Item Description
10
Release 5.1 introduces a Demo License, which enables OSPF, ECMP, VRRP,
SMLT, and IPFIX, or any combination thereof for a period of 30-days. At the
end of the 30-day trial period, the features will be disabled, with the exception
of SMLT. Due to the manner in which SMLT is implemented through cabling,
and the fact that Spanning Tree Protocol needs to be disabled, a loop would
be formed on the network if SMLT was disabled as a feature. Therefore, the
following actions will take place to minimize the potential network impact.
Three traps are sent.
• The first trap is sent five days prior to expiration of the license.
Trap: bsnTrialLicenseExpiration: Trial license 1 will
expire in 5 day(s).
• The second trap is sent one day prior to the expiration of the license.
Trap: bsnTrialLicenseExpiration: Trial license 1 will
expire in 1 day(s).
• The last trap is sent upon termination of the license.
Trap: bsnTrialLicenseExpiration: Trial license 1 has
expired.
At this point, all license features are disabled except SMLT. SMLT will remain
enabled until there is a stack/unit reset. Once the stack/unit is reset, the feature
will be disabled, and a loop will be formed if there has been no intervention to
remove/disable the ports participating in the IST.
Therefore, Nortel recommends that upon receiving the first trap that the
administrator begin to manually disable that feature and ensure that any cabling
loop is removed.
11
When you configure IPFIX to work with NetQoS, Nortel recommends that you
disable the SNMP polling by NetQoS device. To do this, remove the community
string associated with the ERS 5500 Series switch on NetQoS device.
12 Nortel recommends that you do not enable IP Source Guard on trunk ports.
13 Nortel recommends that you do not enable Critical-IP functionality with VRRP in
an SMLT environment.
VLACP issue
It has been found that in some situations, using VLACP on the Ethernet
Routing Switch 5500/5600 the switches will remove a link from service due
to variations in the arrival time of VLACP messages (VLACP PDUs) from
the far end. The issue may exist between the Ethernet Routing Switch
5500/5600 and Ethernet Routing Switch 8300/8600 when running short
timers and default timeout interval of 3 time-outs. The Ethernet Routing
Switch 5500/5600 switches maintain a rolling history of the last 3 received
VLACP PDUs and calculate the time variance across and between these
Nortel Ethernet Routing Switch 5000 Series
Release Notes — Release 6.0
NN47200-400 04.01 Standard
6.0 12 December 2008
Copyright © 2008., Nortel Networks
.