From: rakesh_groupstudy@yahoo.com
Date: Fri Sep 26 2008 - 23:24:23 ART
one final doubt b&. i was messing up with ip cef command and its usgae and
got
this b& is my understanding of the ip cef correct following this paragraph?
Recent Cisco IOS releases have Cisco Express Forwarding (CEF) enabled by
default. CEF allows fast switching of packets based on a per-destination
switching architecture. The first packet in a flow is routed, and the rest
are
switched. This is the preferred behavior in most circumstances, because it
allows load balancing in fast-switching architectures. However, if we were to
ping the destination network, we would not see load balancing occurring on a
packet level because CEF treats the entire series of pings as one flow.
CEF on R3 overrides the per-packet balancing behavior of process switching
with per-destination load balancingb&
my understanding is as follows :
enabling ip cef which is by default means that .. let us say we have two best
routes , the router primarily routes the packet seeing its routing table in
two
ways and from there on it sends the packets in that two ways without any
comparision ?
or b& will it route let us say 10 packets to line 1 and 10 packets to line 2
. is this what is meant by
per-destination load balancingb&
disabling ipcef makes the router / eigrp to route each and every packet b&.
to
the destinationb&
though it is not advised to turn off ip-cef i see one advantage as we can see
perfect load balancing which helps in determinig underused links while period
of congestion as protocol routes every packet b&.?
and may be a real worst or best doubt or i might have seriously overlooked
something?
what is the basic difference between switching and routing in simple words?
or
if needed technical also ...
i thought about it and feeling little nervous asking this question....
i think that routing is sending packet looking at its route table whereas
swithching is based on mac addr table ... ?
am i correct ?
regards
rakesh
i was waiting for an answer and here is the info provided by dark fiber ccie
#21988 below
Blogs and organic groups at http://www.ccie.net
This archive was generated by hypermail 2.1.4 : Sat Oct 04 2008 - 09:26:20 ART