19.10 Router Level of Desperation Control
Let us summarize features of routers might use for desperation control. Routers
consist of basic components like network interfaces, processing modules, buffering
modules (memory), and an internal interconnection unit (switch fabric or bus).
Inbound network interfaces receive packets and forward them to the processing
modules where they will be processed and stored in buffering modules.
Further packages will be forwarded to the outbound interface, to the destination
through the process of path determination.
The major tasks of a router are to determine path from routing table, maintenance, and reachability propagation (route processing).
Both internet protocol: IPv4 and IPv6 still require package processing, packet
forwarding, and some router special services. Searching for a route in the routing
table the longest prefix that matches the destination address of the packet is one of
heaviest function of routing. Nowadays 7Bn IP addresses, in turn, even
cluster-organized and hierarchical making routing tables quite large, and processing
of them is time consuming.
In classless inter-domain routing (CIDR) [19, 20] a block of same class
addresses is arranged as a single routing table entry. When a packet arrives, a
routing table lookup is performed by the router using the packet’s IP destination
address. This process returns the best-matching routing table entry, which identifies
to the router the IP address of the next hop for the specific packet and from which
interface to forward the packet out.
d
s
d
s
Destination has been reached. Still,
other Hx, Hy cumulative
probabilities (desperation control)
over chosen links should be
evaluated. Again, at each step Hx
and Hy ≠ 0 or negative
Job done. DCA with VH works.
(f)
(g)
Fig. 19.7 (continued)
19.10 Router Level of Desperation Control
287
Let us summarize features of routers might use for desperation control. Routers
consist of basic components like network interfaces, processing modules, buffering
modules (memory), and an internal interconnection unit (switch fabric or bus).
Inbound network interfaces receive packets and forward them to the processing
modules where they will be processed and stored in buffering modules.
Further packages will be forwarded to the outbound interface, to the destination
through the process of path determination.
The major tasks of a router are to determine path from routing table, maintenance, and reachability propagation (route processing).
Both internet protocol: IPv4 and IPv6 still require package processing, packet
forwarding, and some router special services. Searching for a route in the routing
table the longest prefix that matches the destination address of the packet is one of
heaviest function of routing. Nowadays 7Bn IP addresses, in turn, even
cluster-organized and hierarchical making routing tables quite large, and processing
of them is time consuming.
In classless inter-domain routing (CIDR) [19, 20] a block of same class
addresses is arranged as a single routing table entry. When a packet arrives, a
routing table lookup is performed by the router using the packet’s IP destination
address. This process returns the best-matching routing table entry, which identifies
to the router the IP address of the next hop for the specific packet and from which
interface to forward the packet out.
d
s
d
s
Destination has been reached. Still,
other Hx, Hy cumulative
probabilities (desperation control)
over chosen links should be
evaluated. Again, at each step Hx
and Hy ≠ 0 or negative
Job done. DCA with VH works.
(f)
(g)
Fig. 19.7 (continued)
19.10 Router Level of Desperation Control
287