Question

In: Computer Science

OSPF and IS-IS are both link-state routing protocols. Explain their differences and commonality.

Expert Solution

OSPF: It is standards-based routing protocol.

Decision based on the best bandwidth. Therefore fast data transfer.

Scalability is large.

Maximum usage of resources such as bandwidth , CPU , RAM etc.

VLSM (variable-length subnet mask) is used.

Implementation and maintenance of network is complex.

Designed to support only IPv4.

More popular and widely used, because it supports all routers.

It has NBMA mode for detecting if it is in this particular network.

It can run over ip and can support vertical links and use IP fragmentation service.

Designated router election is non deterministic.

Reliable flooding mechanism is used reliably on all links.

IS-IS: It is popular in provider networks.

Fastest data transfer.

Large scalability of network.

High resource usage.

VLSM is used.

Higher complexity in implementation and maintenance.

It won't supported by routers such as bay and 3com.

No direct support for connecting NBMA network.

Runs over layer 2, hence cannot support virtual link unless tunnelling is implemented.

Designated router election is deterministic.

On Broadcast link flooding is not done reliably.

venereology answered 1 year ago

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