C L I R E F E R E N C E G U I D E U P D A T E - Dell Networking 7048 Release Note

CLI Reference Guide Updates
Release 5.1.0.1
The following table lists issues found in the CLI Reference Guide after publication:
Command
ip igmp snooping querier
query-interval
terminal monitor
ip mtu
rate-limit cpu direction
pps_value
input pps
no rate-limit cpu direction
input pps
show system internal pktmgr
internal control sw-rate-limit
Release 5.0.1.3
 No Updates
52
The guideline under this command refers to the IGMP Snooping Max Response
Time. A reference that this can be configured using command ip igmp query-max-
response-time under IGMP commands is missing. The default IGMP/MLD snooping
Max Response Time is 25 sec
The command does not have any arguments or a particular expected output hence
an example for this is missing in the guide.
prompt#: terminal monitor
( in privileged exec mode to display logging messages on terminal )
The guideline should be augmented with the below text:
Use the ip mtu command in Interface Configuration mode to set the IP
Maximum Transmission Unit (MTU) on a routing interface. The IP MTU is
the size of the largest IP packet that can be transmitted on the interface
without fragmentation. Packets that are L2 forwarded in hardware ignore the IP
MTU. Packets that are L3 (VLAN routing) forwarded in hardware observe the IP
MTU. Packets forwarded in software are dropped if they exceed the IP MTU of the
outgoing interface.
Use the rate-limit command to reduce the amount of unknown unicast/multicast
packets forwarded to the CPU. Use the "no" form of the command to set the rate
limit to the default value.
pps_value – range 100-1024 packets per second (100-3000 for PC81xx
switches).
The default ingress rate limit is 1024 packets per second (3000 for PC81xx
switches).
This command allows the administrator to reduce the rate limit for which
unknown unicast and multicast packets are forwarded and/or copied to the
CPU. It does not affect the rate limits for control plane packets. It is almost
never necessary to use this command to change from the default value. The use
of this command should be restricted to situations in which moderate to high
rates of unknown unicast/multicast are continually sent to the switch CPU as
evidenced by the show proc cpu command and where the
ipMapForwardingTask is showing high CPU usage. This will occur most
frequently in networks where a high number of ARPs are continually received
on untrusted ports, high numbers of L2 stations are timing out and reappearing
or multicast flooding is occurring in the network. If problems with L2, L3 or
multicast learning occur after changing this value, set the rate limit back to the
default value and take other steps to correct or mitigate the underlying network
issue directly.
Note: This command is not available on the PCM6220 switch.
The show command is to display the configured CPU rate limit for unknown packets
in packets per second.
Note: This command is not available on the PCM6220 switch.
Issue
System Firmware Version 5.1.0.1