The MPLS-OPS Archive

[wayne summers <dannynlg@yahoo.com>]

hello all,
I am a novice to networking and novice to MPLS too..
I would be happy if some could answer me these questions...
thanks,
sinecerely,
wayne summers

1.Suppose that an  MPLS network consisting of N routers supports C DS
traffic classes. A trunk is defined as traffic from a single traffic
class that is aggregated into an LSP.
a.What is the maximum number of trunks if a trunk is defined for every
pair of ingress router and egress router ?
b.Suppose that the trunks in part (a) are merged if they have the same
traffic class and the same egress routers. What is the maximum number
of  multipoint-to-point trees rooted in an egress router ?
c.Can you think of other ways to merge trunks ?

2.Assume that there are N stations(LECs) in an emulated LAN. Suppose
that each station, on average, maintains X ARP entries and that the
station sends an LE_ARP request every T seconds on average. Compute the
approx. number of ARP messages that the LES has to process in this
environment and discuss the scalability of LANE.

3.Suppose that an  MPLS network consisting of N routers supports C DS
traffic classes. A trunk is defined as traffic from a single traffic
class that is aggregated into an LSP.
a.What is the maximum number of trunks if a trunk is defined for every
pair of ingress router and egress router ?
b.Suppose that the trunks in part (a) are merged if they have the same
traffic class and the same egress routers. What is the maximum number
of  multipoint-to-point trees rooted in an egress router ?
c.Can you think of other ways to merge trunks ?

4. Consider explicit routing in MPLS.
a.Can explicit routing in MPLS be used to select a route that meets the
QoS requirements of a particular flow, for example, guaranteed
bandwidth and delay ? Explain.
b.Give an example at a fine level of granularity that can make use of
the QoS explicit routing in part (a). Give another example at a coarser
level of granularity.
c.What info does the first LSR require to select an explicit path ?



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