Comments below.
JMcL
"Tony" @groupstudy.com on 10/08/2001 12:05:30 pm
Please respond to "Tony"
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Subject: ospf costs/metrics [7:15567]
Just so I understand ospf costs/metrics correctly...
For an example....I have a remote WAN router with two PVC's. Both
connections are 56k. One PVC connects to a host circuit @ 1024K and the
other PVC connects to a different host circuit @ 512K.
[JMcL] I assume you mean a 56k CIR on each link, with a total bandwidth
possible of 512k on one link and 1024k on the other?
Because these
connections are serial, without a bandwidth or cost statement on the host
or
remote interfaces will ospf see both circuits as 1536k links and load
balance?
[JMcL] Yes, assuming 1536k is the default (I'm too lazy to check right now
but I think it is). Remember that 'load balance' in this case (OSPF) means
equal load balancing - up to 512k on each link.
With adding a bandwith statement on each host side, I assume ospf
traffic will perfer the 1024 link?
[JMcL] Depends what you set your bandwidth statement to. If you set it to
1024k/512k respectively for the two links, then yes.
Then what if I add a higher cost (say
above 1785) on the remote circuit that connects back to the 1024k host,
will
it then perfer the 512k?
[JMcL] Again, I'm too lazy to check the maths - assuming that a bandwidth
of 512k works out at a cost of 1785, then yes. You can fiddle the cost
either indirectly by changing the bandwidth parameter or directly by
changing the ospf cost parameter - generally changing the cost parameter is
less confusing, IMO.
Sorry about all of the questions, I am just somewhat confused.
[JMcL] Sounds like you've got it straight to me.
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