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Recommendations and feature-specific information about release 2.0.7.8
•
Nortel Networks recommends against configuring VRRP on IP-subnet-based
VLANs because there is no hardware support for this configuration in the I/O
modules and all traffic forwarding must be handled by the CPU. This situation
can cause high CPU utilization and affect performance. (105851-1)
•
VRRP running over IEEE 802.1Q tagged ports requires ARU3 modules (-B
hardware). (115732-1, 130826-1)
•
On a Passport 1200 Switch, IP forwarding is enabled by default. (142874-1)
Multicast in release 2.0.7.8
The two software features DVMRP and IGMP have known problems that can
cause general operational issues with Passport 1000 Series switches. Therefore, IP
Multicast is not supported in release 2.0.7.8 or earlier releases.
STG and BPDU clarification
The following two controls regulate the behavior of the Spanning Tree Protocol
(STP) in a spanning tree group (STG) on a Passport 1000 Series switch:
•
A global parameter to enable or disable STP at the STG level
•
Port parameters to enable or disable STP on individual ports
When the STP is globally disabled on the STG, received bridge protocol data units
(BPDUs) are handled like a MAC-level multicast and flooded out the other ports
of the STG. Note that an STG can contain one or more VLANs. Remember that
MAC broadcasts are flooded out on all ports of a VLAN; a BPDU is a MAC-level
message, but the BPDU is flooded out on all the ports in the STG, which may
encompass many VLANs.
Release Notes for the Passport 1000 Series Software Release 2.0.7.8
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