Comments (2)
Yes you can do it, however you have to use the manual IP assignment strategy:
https://github.com/nsg-ethz/p4-utils#assignment_strategy
Then for each host you can set an IP and Gateway IP. You can also assign IPs to switches however they will not be directly assigned to the interfaces but they will be stored in the Topology object in case you need to know them. To assign switches IPs you need to do the following:
"switches": {
"s1": {
"cpu_port" : true,
"h1" : "10.0.1.1/24",
"s2" : "10.0.2.1/24"
}
So for example for the interface facing h1 you want 10.0.1.1/24
.
The reason why switches can not get IPs assigned is the following: when a packet is sent between the virtual ethernet interfaces the linux network stack will check if it can forward that packet directly using its own routing table making the packet jump from one interface to the other without even crossing switches. For example:
h1------(10.0.1.1/24)sw1-------sw2-----sw3(10.0.3.1/24)------(10.0.3.2)h2.
Imagine that h1 is sending a packet to h2. This type of switches are configured in the main namespace of the linux network container, meaning that all the interfaces that you configure there share the same network stack. When you set the ip of sw1 and sw3 the linux routing table will have some entries that say that packets forwarded to 10.0.1.0/24 and 10.0.3.0/24 have to be sent to some known interface so when the packet with destination h2 arrives at sw1 even before it enters the switch, the linux kernel will send the packet directly to the sw3 interface, thus jumping sw2. However as i noted before, it is not necessary to set the IPs directly to the interface, you can still emulate it pretty well if you use the right controller/P4 code.
from p4-utils.
Got it. Many thanks for your detailed reply!
from p4-utils.
Related Issues (20)
- Using @controller_header
- How to run multiple controllers HOT 6
- How to clone packets more than once back to back? HOT 2
- Tofino Example: no bf_swithcd for one of the switches HOT 3
- Why SimpleSwitchP4RuntimeAPI doesn't support reading and writing register? HOT 1
- Problem with the “sudo p4run --config p4app.json” command regarding ping between hosts HOT 3
- Read and write to registers HOT 6
- Installing issue HOT 6
- Username and password for pre-installed VM HOT 2
- Problem with switch_thrift_API.py file
- Graceful shutdown when stopping with Ctrl+C HOT 1
- Does P4Utils Support IPv6 ? HOT 3
- register cell size HOT 1
- p4run problem HOT 5
- virtualenv problem HOT 2
- Format for providing launch options for a P4 switch HOT 3
- FRR Router binary path /usr/local/sbin does not contain daemons
- Example cannot pingall after enough long time
- Install error libpiprotobuf.so: undefined references
- Meter rates: docs state units/second, while code uses units/microsecond
Recommend Projects
-
React
A declarative, efficient, and flexible JavaScript library for building user interfaces.
-
Vue.js
🖖 Vue.js is a progressive, incrementally-adoptable JavaScript framework for building UI on the web.
-
Typescript
TypeScript is a superset of JavaScript that compiles to clean JavaScript output.
-
TensorFlow
An Open Source Machine Learning Framework for Everyone
-
Django
The Web framework for perfectionists with deadlines.
-
Laravel
A PHP framework for web artisans
-
D3
Bring data to life with SVG, Canvas and HTML. 📊📈🎉
-
Recommend Topics
-
javascript
JavaScript (JS) is a lightweight interpreted programming language with first-class functions.
-
web
Some thing interesting about web. New door for the world.
-
server
A server is a program made to process requests and deliver data to clients.
-
Machine learning
Machine learning is a way of modeling and interpreting data that allows a piece of software to respond intelligently.
-
Visualization
Some thing interesting about visualization, use data art
-
Game
Some thing interesting about game, make everyone happy.
Recommend Org
-
Facebook
We are working to build community through open source technology. NB: members must have two-factor auth.
-
Microsoft
Open source projects and samples from Microsoft.
-
Google
Google ❤️ Open Source for everyone.
-
Alibaba
Alibaba Open Source for everyone
-
D3
Data-Driven Documents codes.
-
Tencent
China tencent open source team.
from p4-utils.