Showing posts with label OSPF. Show all posts
Showing posts with label OSPF. Show all posts

Sunday, 13 January 2013

Passive-interface command behavior in RIP, EIGRP & OSPF


Passive-interface command is used in all routing protocols to disable sending updates out from a specific interface. However the command behavior varies from o­ne protocol to another.

In RIP this command will disable sending multicast updates via a specific interface but will allow listening to incoming updates from other RIP speaking neighbors.

This simply means that the router will still be able to receive updates o­n that passive interface and use them in the routing table.

In EIGRP the passive-interface command stops sending outgoing hello packets, hence the router can not form any neighbor relationship via the passive interface. This behavior stops both outgoing and incoming routing updates.

In OSPF the passive-interface has a similar behavior to EIGRP. The command suppresses hello packets and hence neighbor relationships.

Tuesday, 12 June 2012

OSPF - LSA Types ( 5 Types)



OSPF - LSA Types:

Type 1 - Sent by routers within the Area, including the list of directly attached links. Does not cross the ABR or ASBR.