Cisco Cisco Packet Data Gateway (PDG)
Command Changes
checkpoint session compression
A new keyword has been added to the SRP Configuration mode checkpoint session command. The
compression keyword allows the user to enable the use of the LZ4 compression algorithm.
compression keyword allows the user to enable the use of the LZ4 compression algorithm.
The compression keyword will only appear if a special ICSR optimization feature license has been
purchased and installed. Contact your Cisco account representative for assistance.
purchased and installed. Contact your Cisco account representative for assistance.
Important
configure
context context_name
service-redundancy-protocol
checkpoint session compression { lz4 | zlib }
default checkpoint session compression
no checkpoint session
end
default checkpoint session compression
no checkpoint session
end
Notes:
• LZ4 compression is effective only if both chassis are configured with LZ4. If any one chassis has zlib
(default) configured, the compression algorithm reverts to zlib. The algorithm is negotiated only during
initial socket establishment. Once agreed no more negotiation takes place until the TCP socket connection
is reset.
initial socket establishment. Once agreed no more negotiation takes place until the TCP socket connection
is reset.
• default reverts SRP to using the zlib compression algorithm.
A change in the configured compression algorithm resets the TCP Link.
Important
Performance Indicator Changes
show session subsystem facility sessmgr
This show command now provides information and statistics for the SRP compression algorithm used for
geographic redundancy (ICSR).
geographic redundancy (ICSR).
• Geog Redundancy Compression Info
• Chkpoint Compression Supported: <lz4 or zlib>
• Chkpoint Compress Agreed: <lz4 or zlib>
• <lz4 or zlib> Compression Statistics:
◦CompSuccess
◦DeCompSuccess
◦CompFailure
Release Change Reference, StarOS Release 19
467
System Changes in Release 19
Support for LZ4 Compression Algorithm