I guess what everyone is getting at is which is better?
72 which is Immediate, High Throughput, 010 010 00
80 which is Immediate, Low Delay, 010 100 00
88 which is Immediate, Low Delay, High Throughput, 010 110 00
90 which is Immediate, Low Delay, Low Cost 010 10 10
92 which is Immediate, Low Delay, High Throughput, High Reliability 010 111 00
And whoever suggested using Low Cost is plain wrong.
Thats for like NNTP, news servers. Not really important stuff takes a slow low cost route.
Reading RCF 1349, it states you have 5 choices in TOS.
0000 (all normal) Use default metric
1000 (minimize delay) Use delay metric
0100 (maximize throughput) Use default metric
0010 (maximize reliability) Use reliability metric
0001 (minimize monetary cost) Use cost metric
other Use default metric
So if when you choose DTR and cost, you can only choose one. Otherwise it looks like defualt.
Example 92, 010 111 00 would look 010 000 00.
1110 would go to defualt of 0000 according to RCF 1349, minimize delay.
If you choose 80, 010 100 00 then it would look the same.
I was recently reading section 4 of RCF 2474.
I maybe wrong, but it looks like cost field does nothing.
It is totally ignored.
It also looks like DTR is now ignored too.
It looks like, according to RCF 2474, if you were trying 010 110 10 the router would just see 101 000 00.
Someone asked about why not increase priority higher?
Anything higher then 010, Immediate, are ment for internal network use. Meaning packets that are not ment to route to the internet.
I'd just use 80 or 72, and stick with that.