... another technique is to open up a second telnet
session to the router. You use the first for troubleshooting the router and changing the
configuration, and the second to read the output of the ... that the command provides to the user. For example,
if you issue a show isis interface brief command, then the output shows you
all interfaces that have IS-IS configured. The ke...
... elected. The DIS is a router among the IS-IS routers on the LAN, which
has, additionally to its normal duties, the purpose of representing the LAN in the link-state
database. Because the node that the ... farther across the network. So let’s be
nice to these routers and not overload them, as we need them to distribute reachability
information of all types.
Most modern impl...
... testing, there is no better test
than to expose the code to the real world. Here for the first time a routing protocol
leaves the safety of the pool and is hit by the crashing waves of the Internet. ... needed to an IS-IS route, simply revisit the stored prefixes and
look to see if the old IS-IS route is still the best route. The router does that by checking
if the...
... in the core topology. As soon as the traffic arrives at the
ingress of the TE tunnel (Paris), an additional label is PUSHed on top of the label stack
and the traffic is sent down the TE tunnel. The ... find the
shortest path node between the source and the destination point. In our example, the path
via Paris, Frankfurt and London fits all the constraints and therefore...
... within the ITU. There are voices in the IETF that would either force the two stan-
dards bodies to work together, or completely transfer responsibility for the IS-IS protocol
from the ITU-T to the ... connecting the router with a UNI interface the optical topology is not revealed to
the IP routers
it does not yet reveal the topology of the optical domain to the IP r...