Hop Count Limits

[rossua994]

I understand that the hop count limits for networks running distance vector routing protocols are :-

RIP (v1 or v2) : 15

IGRP : 255 (with 100 the default limit)

Are these the correct figures ? Also are there any hop count limits applicable to networks running other types of routing protocol such as OSPF, EIGRP, and IS-IS ?

[deveshkumar]

Yes...this is correct,

Other protocols doesn't have any hop count liit,

But still maixmum hopcount for other protocols remains 255 as max. As TTL is decreamented by 1 after corssing every hop. When ttl reaches to 0, that packets are dropped. any packet has max ttl value of 255, hence max hops for other protocols is 255.

[Pavel Bykov]

TTL field itself is 8 bits, that's why you cannot have higher TTL than 255.