We currently have dual links between our core routers (7206VXRs) - Primary being ATM, and secondary being Ethernet - At present, Ethernet is only used if ATM fails(This is achieved via OSPF)....we presently only have mpls enabled on the ATM links.
We are wanting to make more efficient use of the backup ethernet links(As they are expensive)....hoping that TE is the correct(best practice) option.
Our current bandwidth is as follows:
ATM - 8Mb
Ethernet - 4Mb
Our goal is to (hopefully) have a total of 12Mb bandwidth available for use(i.e. Load-share over both the ATM+Ethernet links)......Is FRR necessary in what we are wanting to achieve?
as load sharing over TE tunnels is done by CEF and unequal cost is taken into account, onl two tunnels are needed. So create one 4 Mbps and one 8 Mbps Tunnel (or 800 kbps and 400 kbps with the same result) and route them over the respective links. Do not forget about the return path!
Yes. you do not need to lockdown the 8 Mbps tunnel, it will only find one path anyhow. Make sure the 4 Mbps tunnel does not have higher hold priority than the setup priority of the bigger tunnel any they sould end up in the prefered links.
CEF will do te load sharing based on reserved bandwidth, i.e. 2:1 though IP routing will see two parallel equal cost pathes. Make sure the tunnel is announced to IP routing (autoroute announce) and has better metric than the physical path (relative metric -1).
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