Question:
First post here
and cisco ios commands I did do a search, but didnt come up with much.
I have two GRE
tunnels across 2 seperate WAN links. One link is 45 Mbps and the other link is
6Mpbs. I was thinking the Variance command would be the choice here(well only
choice) since we are running EIGRP.
Below are the
(Edited)configs on the spokes
First tunnel
INTERFACE
TUNNEL 10500
DESCRIPTION
45Mbps
DAMPENING
BANDWIDTH 45000
IP ADDRESS
X.X.X.X
TUNNEL SOURCE
X.X.X.30
TUNNEL MODE
IPSECIPV4
TUNNEL
DESTINATION X.X.X.29
SERVICE POLICY
OUTPUT SHAPING-45000
Second Tunnel
INTERFACE
TUNNEL 10501
DESCRIPTION
6Mbps
DAMPENING
BANDWIDTH 6312
IP ADDRESS
X.X.X.X.
TUNNEL SOURCE
SERIAL 0/0/0
TUNNEL
DESTINATION X.X.X.46
SERVICE POLICY
OUTPUT SHAPING-6312
This is my
first project for my new job, so I obviously want to get it right. If I am
missing some critical information or you need clarification on something,
please do not hesitate to request it.
Thanks in
advance
Answer:
If you do a sh
ip route eigrp at present their should
be only on path for all routes in the rib table.
Now when you
apply a variance value this will install another path into the rib, meaning you
will then have two paths showing in the routing table.
The variance
calculation can be done by the metric extracted from the Eigrp topology table:
P
10.170.9.24/30, 1 successors, FD is 1345280
via 10.170.2.50 (1345280/65280),
Tunnel10500, serno 72548
via 10.170.2.56 (1688576/65280),
Tunnel10501, serno 72568
1345280/1688576
=1.25 round out the highest value =
variance 2
@Richard/Joseph
I think what I
am trying to get at, is with or without the variance, CEF will default to
forward via per destination anyway. I agree deterministically if the variance
is applied and a new path is now availble, another scr/dst could use this new
path, BUT wouldnt this other scr/dst always use that same path, and not load
share between the two without per-packet...correct???
(by the way in
my testing Cisco Switches Price i used a variance of 9)
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