lsa check sum

[zeeshanr202]

hi

i need some help about checksum field in lsa

when a router receives more than single lsa of same type from the same advertising router, it follows the following step in selection

sequence number if the sequence numbers are same then check the checksum field if checksum is same then check age field.

the only thing puzzling me is checksum

how can checksum could be different for same lsa with same sequence number?

could any one please explain it?

thanks

[bwilmoth]

The updates advertised might be diffferent either addition or deletion of the updates.Any change in the network would be advertised. So thoguh the sequence is same checksum could be different as updates carried might be different.

[zeeshanr202]

thanks a lot. i got it now