@@ -31,7 +31,7 @@ The code you wrote before should still compile in this slightly different setup.
* start a Mininet instance with three switches (`s1`, `s2`, `s3`) configured
in a triangle, each connected to one host (`h1`, `h2`, `h3`).
* The hosts are assigned IPs of `10.0.1.1`, `10.0.2.2`, etc.
* We use the IP address 10.0.0.1 to indicate traffic that should be
* We use the IP address `10.0.0.1` to indicate traffic that should be
load balanced between `h2` and `h3`.
* install the rules from `s2-runtime.json` and `s3-runtime.json`
2. Open another shell in this directory and run the starter code:
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@@ -61,9 +61,7 @@ The code you wrote before should still compile in this slightly different setup.
To send 10 messages with random lengths
6. Type `exit` to leave each XTerm and the Mininet command line.
The message was not received because the ingress tables in s1 are not populated yet.
You will now finish the `balance_controller.py` program toinsert and modify entries into
s1's ingress tables.
The message was not received because the ingress tables in s1 are not populated yet. You will now finish the `balance_controller.py` program to insert and modify entries into s1's ingress tables.
## Step 3: Implement Control for Load Balancing
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@@ -73,7 +71,7 @@ The `load_balance.p4` program needs to be extended with 2 features:
Each counter corresponds to one of the two outgoing links. Each should count
the number of bytes (number of packets as in p4runtime is not needed) going
over that link.
2. Add a 32 bit parameter to the set_nhop action called link_index which
2. Add a 32 bit parameter to the `set_nhop` action called `link_index` which
indicates which link the packet should be sent over. Use this to increment
the counter corresponding to this link
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@@ -87,8 +85,7 @@ A complete `balance_controller.py` will contain the following components:
1.**TODO** A function that writes the ecmp group values called `writeEcmpGroupValues`
2.**TODO** A function that writes the next hop rules called `writeEcmpNextHopRules`.
This function will:
1. Create a total of NHOP_TABLE_ENTRIES (default 100) table entries, divided over
the two links according to the provided division in `entry_amounts`
1. Create a total of `NHOP_TABLE_ENTRIES` (default 100) table entries, divided over the two links according to the provided division in `entry_amounts`
2. Write the table entries to the switch using the provided `update_type`.
This is because we need to specify that we are doing a `MODIFY` operation
when changing the table entries instead of inserting them.
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@@ -105,9 +102,9 @@ A complete `balance_controller.py` will contain the following components:
the function `writeEcmpNextHopRules` to set the initial entries.
9. The main function that:
1. Sets up the helper and switch
2.**TODO** Every 2 seconds reads out the 2 counters and computes the new entry_amounts
3.**TODO** Use the new entry_amounts write the new ECMP next hop rules
4.**TODO** Prints the load counter and entry_amounts
2.**TODO** Every 2 seconds reads out the 2 counters and computes the new `entry_amounts`
3.**TODO** Use the new `entry_amounts` write the new ECMP next hop rules
4.**TODO** Prints the load counter and `entry_amounts`
10. Some code that parses the command line arguments and does input validation
