The Explicit Congestion Notification (FECN, c & 39; is & quot; feckon & quot;) bit is set to zero by default and is set to 1 if congestion, including the framework and direction & 39; in which the image was to & 39; abroad. A DCE (frame relay switch), this bit, and a DTE (router), and to see that traffic congestion along the backbone of the network bottlenecks path.
If d & 39; strangulation in the opposite direction, as part s been & 39; The trip, & 39; sending bills Explicit Congestion Notification (BECN, c & 39; is & quot; attract & quot;) is 1 through a DCE.
If this is your first time working with BECNs and FECNs, you wonder why the BECN exist yet - after all, why step backwards & quot; notification & quot;? The BECN is actually the most important part of this process, given that c & 39; is the BECN bit & 39; indicates that the sender must be to slow down!
For example, managers, Kansas City Green Bay after the meeting in traffic jams, the FR cloud. A cadre de la mise Switch FECN bit & quot; 1 & quot;. The notification of KC & 39; for the rapid transmission of data, the United Kingdom send images with the new BECN bit. If KC BECN bit 1, KC-router knows that overloading & 39; s is produced when images transmitted by KC GB.
Frame relay adaptive BECN can shape a new router in a dynamic way on gas, transmission rate is, it & 39; s Within & 39; the remote host with the BECN bit. In this case, KC, provides that the visits, which for & 39; sending Go is the encounter traffic jams because traffic comes from the United Kingdom has the BECN bit. If BECN Adaptive form works on KC, that adaptation to router congestion by slowing its rate of transmission. If BECNs has just & 39; stop the United Kingdom, KC and begins to send to a form rate.
BECN Adaptive is configured as follows:
KC (config) int s0
KC (config-if) Frame Relay adaptive becn
To to see how Managers come and go, and with BECN put FECN bit, run under show pvc.
R3 show framework pvc
& lt; kidnapped a few outings for the clarity & gt;
input packages output 306 packages 609 bytes of 79364 bytes 45566
out packets dropped 0 to FECN packages 0
in BECN packages 0 out FECN packages 0 out BECN 0
in packages packets packages 0 bcast 0
out out of a file index & 39; packets 568 bytes out bcast create a file d & 39; index 75128
pvc time 01:26:27 recently changed the status of PVC 01:26: 27
Just out & quot; and & quot; & quot; and exit & amp; quot; BECN, FECN, and the & 39; examination of the room and your production networks!
Chris Bryant, CCIE 12933, the owner of The Bryant Advantage, home of free CCNA and CCNP tutorials, The Ultimate CCNA Study Package, and Ultimate CCNP Study Packages.
You may also feed and visit his blog, the Beyond day several times a day with new articles of Cisco certification, and every day free courses & 39; instruction CCNA / CCNP consideration of questions! Details are available on the website.
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