R3102-R3103-HP 6600/HSR6600 Routers Network Management and Monitoring Configuration Guide

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• Inactive flow aging—A flow is considered inactive if its statistics have not been changed. No
packet for this IPv6 NetStream entry arrives in the time specified by the ipv6 netstream timeout
inactive command. The inactive flow entry remains in the cache until the inactive timer expires. Then,
the inactive flow is aged out and its statistics, which can no longer be displayed by the display ipv6
netstream cache command, are sent to the NetStream server. The inactive flow aging ensures the
cache is big enough for new flow entries.
• Active flow aging—An active flow is aged out when the time specified by the ipv6 netstream
timeout active command is reached, and its statistics are exported to the NetStream server. The
device continues to count the active flow statistics, which can be displayed by the display ipv6
netstream cache command. The active flow aging exports the statistics of active flows to the
NetStream server.
Forced aging
Use the reset ipv6 netstream statistics command to age out all IPv6 NetStream entries in the cache and
to clear the statistics. This is forced aging. Alternatively, use the ipv6 netstream max-entry command to
configure aging out of entries in the cache if the maximum number of entries is reached.
TCP FIN- and RST-triggered aging
For a TCP connection, when a packet with a FIN or RST flag is sent out, it means that a session is finished.
If a packet with a FIN or RST flag is recorded for a flow with the IPv6 NetStream entry already created,
the flow is aged out immediately. However, if the packet with a FIN or RST flag is the first packet of a flow,
a new IPv6 NetStream entry is created instead of being aged out. This type of aging is enabled by
default, and it cannot be disabled.
Configuration procedure
To configure flow aging:
Ste
p
Command Remarks
1. Enter system view.
system-view N/A
2. Configure periodical
aging.
• Set the aging timer for active
flows:
ipv6 netstream timeout active
minutes
• Set the aging timer for inactive
flows:
ipv6 netstream timeout inactive
seconds
Optional.
By default:
• The aging timer for active flows is
30 minutes.
• The aging timer for inactive flows is
30 seconds.
3. Configure forced
aging of the IPv6
NetStream entries.
a. Set the maximum entries that
the cache can
accommodate, and the
processing method if the
upper limit is reached:
ipv6 netstream max-entry
{ max-entries | aging |
disable-caching }
b. Exit to user view:
quit
c. Configure forced aging:
reset ipv6 netstream statistics
Optional.
By default, the cache can
accommodate a maximum of 620000
entries, and the device ages out the
entries when the upper limit is reached.
The ipv6 netstream max-entry
command is only supported on 6602
and HSR6602 routers.
The reset ipv6 netstream statistics
command also clears the cache.