>Which is more common - OSPF or EIGRP?
OSPF by far, with a niche for ISIS in large carriers, and significant
use of RIP in small networks.
>
>Hi
>
>I am wondering which routing protocol is more common in the industries -
>OSPF or EIGRP ?]
>
>i am trying to implement some routing protocol on my HQ with several (20+)
>branches (with only 1 router in each branch) using hub-and-spoke design.
Give careful thought to whether or not you need a routing protocol or
not. Static routes, possibly with backup static routes, may be much
simpler.
Routing protocols sometimes are used to provide a keepalive function
rather than really conveying routing information. If an individual
PVC fails in frame, ATM, etc., and your particular combination of IOS
and carrier don't support recognition of down subinterfaces, it's not
uncommon to use a routing protocol with hellos to detect the failure
and trigger backup. Sometimes, you can avoid this by initiating
backup at the remote sites only, which have only one VC.
>
>I am wondering which protocol so i use? OSPF or EIGRP ?
>
>Is there a limit on the number of areas that one can create with OSPF?
The protocol itself doesn't have a significant limit -- an area
identifier is 32 bits long. Large numbers of nonzero areas can, if
you follow ABR configuration guidelines strictly, require large
numbers of ABRs. On the other hand, if not much will happen in any
given area, the limit of 2 nonzero areas per ABR is extremely
conservative and can be violated.
It really depends what you are trying to do. Remember that Area
0.0.0.0 can be no more than a collapsed backbone LAN (or pair of
LANs), with many WAN subinterfaces on one or two ABRs, the
subinterfaces being in nonzero areas.
>
>Any help will be appreciated. Thanks
>
>
>Regards
>
>
>
>
>
>
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