Use the compress
[predictor|stac|mppc]
command to configure point-to-point software compression for a LAPB,
PPP, or HDLC link. Data-compression schemes used in internetworking
devices are referred to as lossless compression algorithms.
These schemes reproduce the original bit streams exactly, with no
degradation or loss, a feature that is required by routers and other
devices to transport data across the network:
Router(config-if)#compress [predictor
| stac | mppc]
Use the frame-relay
payload-compress command to enable
STAC compression on a specified Frame Relay point-to-point interface
or subinterface:
Router(config-if)#frame-relay
payload-compress
Use the x25 map
compressdtcp command to map compressed
TCP headers to an X.121 address for a given link.
Use the ip tcp
header-compression command to enable
TCP header compression. The passive keyword compresses outgoing TCP
packets, only if incoming TCP packets on the same interface are
compressed. If passive is not specified, the router will compress
all traffic:
Router(config-if)#ip tcp
header-compression [passive]
Remember: Never recompress data. Compressed
data does not compress; it actually expands.
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Lab
Activity |
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Our
company has analyzed the bandwidth usage on
our EastCoast to WestCoast ISDN connection. It
has been found that we are using the ISDN line
to the maximum. There is not enough money in
the budget to upgrade the line to a PRI link,
or to allow the ISDN line to be on all the
time. It is our responsibility to find a way
to move more information across the link in
less time. Our solution: Compression. |
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Lab
Activity |
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Our
company has analyzed the bandwidth usage on
our Houston to Orlando Frame Relay connection.
It has been found that we are using the Frame
Relay line to the maximum. There is not enough
money in the budget to upgrade the line. It is
our responsibility to find a way to move more
information across the link. Our solution:
Compression. |
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