Hop Count Limits

rossua994 · ‎08-08-2007

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 · ‎08-08-2007

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 · ‎08-08-2007

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