Nortel 5000 Series Release Notes

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44 Known issues and limitationsItem Description10 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 theend of the 30-day trial period, the features will be disabled, with the exceptionof 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 wouldbe formed on the network if SMLT was disabled as a feature. Therefore, thefollowing 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 willexpire in 5 day(s).• The second trap is sent one day prior to the expiration of the license.Trap: bsnTrialLicenseExpiration: Trial license 1 willexpire in 1 day(s).• The last trap is sent upon termination of the license.Trap: bsnTrialLicenseExpiration: Trial license 1 hasexpired.At this point, all license features are disabled except SMLT. SMLT will remainenabled until there is a stack/unit reset. Once the stack/unit is reset, the featurewill be disabled, and a loop will be formed if there has been no intervention toremove/disable the ports participating in the IST.Therefore, Nortel recommends that upon receiving the first trap that theadministrator begin to manually disable that feature and ensure that any cablingloop is removed.11 When you configure IPFIX to work with NetQoS, Nortel recommends that youdisable the SNMP polling by NetQoS device. To do this, remove the communitystring 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 inan SMLT environment.VLACP issueIt has been found that in some situations, using VLACP on the EthernetRouting Switch 5500/5600 the switches will remove a link from service dueto variations in the arrival time of VLACP messages (VLACP PDUs) fromthe far end. The issue may exist between the Ethernet Routing Switch5500/5600 and Ethernet Routing Switch 8300/8600 when running shorttimers and default timeout interval of 3 time-outs. The Ethernet RoutingSwitch 5500/5600 switches maintain a rolling history of the last 3 receivedVLACP PDUs and calculate the time variance across and between theseNortel Ethernet Routing Switch 5000 SeriesRelease Notes — Release 6.0NN47200-400 04.01 Standard6.0 12 December 2008Copyright © 2008., Nortel Networks.