Changes between Initial Version and Version 1 of Tutorials/Optical/Mininet Optical Tutorial1

Timestamp:

Jul 26, 2022, 9:30:14 PM (3 years ago)

Author:

lantz

Comment:

initial edits - WIP

Tutorials/Optical/Mininet Optical Tutorial1

@@ +1 @@
+[[Include(WikiToC)]]
+
+== Setting up a Virtual/Simulated Optical Network using the Mininet-Optical Software Emulator ==
+This wiki page contains a tutorial for setting up an optical network using [https://mininet-optical.org Mininet-Optical].
+
+This is a Mininet-Optical version of the tutorial at [wiki:Tutorials/Optical/Tutorial1]. It is intended to show how an experiment designed for the COSMOS testbed may be  adapted for use in a software emulation environment, and how Mininet-Optical may be used to design experiments that will later be run on the COSMOS hardware testbed.
+
+Please refer to [wiki:Tutorials/Optical/Tutorial1] for comparison between the hardware and software testbed environments.
+
+Author: Bob Lantz
+
+Original Authors:
+
+Artur Minakhmetov, Telecom Paris : artur.minakhmetov[at]telecom-paris.fr\\
+Craig Gutterman, Columbia University : clg2168[at]columbia.edu\\
+Michael Sherman, Rutgers University : msherman[at]winlab.rutgers.edu\\
+Jiakai Yu, University of Arizona : jiakaiyu[at]email.arizona.edu\\
+Tingjun Chen, Columbia University: tc2668[at]columbia.edu\\
+
+Change Log
+
+26 July 2022: created new version for Mininet-Optical.
+
+----
+= Description =
+The COSMOS testbed enables creation and use of optical networks of various topologies. An example of how an optical network could be configured and used is provided. A simple experiment on switching of optical paths is described.
+
+----
+
+= Compute Nodes and ToR switch interfaces used =
+
+* Each compute node has 1 Ethernet interface:
+{{{
+server1-eth0
+server2-eth0
+server2-eth0
+}}}
+
+* There are three ToR Ethernet interfaces:
+{{{
+tor1-eth111
+tor2-eth112
+tor3-eth113
+}}}
+
+* and three WDM transceivers, with separate output and input ports:
+
+{{{
+tor1-wdm320/321
+tor2-wdm290/291
+tor3-wdm310/311
+}}}
+
+
+----
+
+= Experiment_1 Context =
+ || [[Image(Experiment_1.png, width=500px)]] ||
+Fig.1 Logical Topology of Experiment_1
+
+The experiment consists of changing the light path from ToR1<-->ToR2 to ToR1<-->ToR3, representing changing of the light path in a C-RAN when “Client” wants to move its base-band processing from “Edge Cloud” to “Central Cloud”.
+
+Experiment includes 3 servers:
+{{{
+server1
+server2
+server3
+}}}
+
+Experiment includes 4 ROADMs:
+{{{
+roadm1 (localhost:1831)
+roadm2 (localhost:1832)
+roadm3 (localhost:1833)
+roadm4 (localhost:1844)
+}}}
+
+
+3 ToR interfaces are connected to the 3 servers:
+
+{{{
+tor1-eth111 <--> server1
+tor2-eth112 <--> server2
+tor3-eth113 <--> server3
+}}}
+
+
+3 Ethernet interfaces and 3 WDM transceivers will be connected within the ToR switch:
+
+{{{
+tor1-eth111 ; tor1-wdm320/321  (output/input)
+tor2-eth112 ; tor2-wdm290/291  (output/input)
+tor3-eth113 ; tor3-wdm310/311  (output/input)
+}}}
+
+
+We are assigning next wavelengths to the transceivers:
+
+{{{
+1553,30 nm 193,00 with bandwidth ~[192.95;193.05] Thz
+This corresponds to channel XX in Mininet-Optical's default channel grid.
+}}}
+
+
+----
+= Setting Up the Optical Topology =
+
+In the COSMOS optical testbed, all devices are connected to a Calient S320 space switch. This switch serves as a programmable patch panel that allows any port to be connected to any other port, enabling realization of arbitrary topologies with fast reconnection between experiments.
+
+It is possible to create a virtual space switch/programmable patch panel in Mininet-Optical to emulate the COSMOS optical testbed itself, but for this tutorial we will implement the topology using Mininet-Optical's topology API.
+
+The Mininet-Optical emulated network is created using a Python script, examples/cosmostutorial.py. Take a look at it now to see how the topology is implemented.
+
+The topology itself is created using Mininet's high-level topology template API. Specifically, we create a subclass of class Topo and override the build() method:
+
+
+{{{#!python
+class TutorialTopo( Topo ):
+...
+    def build( self ):
+}}}
+
+
+ROADMs and ToR switches are added using addSwitch() calls:
+
+{{{#!python
+        # ROADMs
+        NC = NetconfPortBase
+        roadm4 = self.addSwitch('roadm4', cls=LROADM, netconfPort=NC+4)
+        ...
+        # ToR switches
+        tor1 = self.addSwitch('tor1', cls=Terminal, transceivers=[('32', 0*dBm)])
+        ...
+}}}
+
+Servers are added using addHost calls:
+
+{{{#!python
+class TutorialTopo( Topo ):
+        # Servers
+        server1 = self.addHost('server1')
+        ...
+}}}
+
+In Mininet, ports are created by specifying port numbers when we add links.
+(This is due to the underlying link emulation which uses Linux virtual Ethernet (veth)
+pairs.)
+
+Because of this, we need to specify the correct port numbers when we create the links.
+
+The base port numbers for a Lumentum ROADM20 are specified at the top of the file:
+
+{{{#!python
+# Lumentum Roadm20 Port numbering
+LINEIN, LINEOUT = 5101, 4201
+ADD, DROP = 4100, 5200
+}}}
+
+The server and ToR port numbers are as specified above.
+
+WDM fiber links are unidirectional and are added using wdmLink calls:
+{{{#!python
+        # Inter-ROADM links
+        # We put 22km of fiber between roadm2 and roadm3
+        # Default fiber length is 1m if not specified
+        ...
+        self.wdmLink(roadm2, roadm3, LINEOUT, LINEIN, spans=[22*km])
+        self.wdmLink(roadm3, roadm2, LINEOUT, LINEIN, spans=[22*km])
+        ...
+        # ROADM add/drop 2 <-> ToR transceiver links
+        self.wdmLink(tor1, roadm4, 320, ADD+2)
+        self.wdmLink(roadm4, tor1, DROP+2, 321)
+}}}
+
+We can see that LINEOUT of roadm2 is connected to LINEIN of roadm3 and vice-versa,
+with a 22km length of fiber in between, corresponding to a fiber spool in
+the COSMOS testbed. Later, add/drop port 2 of roadm4 is connected to ports
+320/321 of tor1 (output/input, respectively).
+
+Ethernet links are added sing addLink() calls:
+{{{#!python
+        # Server<->ToR Ethernet links
+        self.addLink(server1, tor1, port1=0, port2=1)
+        self.addLink(server2, tor2, port1=0, port2=2)
+        self.addLink(server3, tor3, port1=0, port2=3)
+}}}
+
+----
+
+
+WORK IN PROGRESS!!!
+
+...
+
+
+
+= ROADMs Configuration =
+All of these configurations can be performed by Python scripts developed to work with the COSMOS test-bed. The Python commands send NETCONF commands to the ROADM.
+
+== Setting “Snake” Connection ==
+Correct ROADM operation requires Line In port of a ROADM to always receive a light. That is why there is a dedicated transceiver (tengigabitethernet 1/33 on ToR) that sends light through all ROADMs by passing through loop-back connection on Calient S320 (port 5.5.1) and redirecting back, so the light is received on the same transceiver.
+This kind of connection is called “Snake”.
+
+In order maintain this “Snake” for “Experiment_1” next connections form Table 1 must be in place: 1,3,5,6,8,9.
+
+=== tengigabitethernet 1/33/1 on ToR configuration ===
+
+Snake Interface (to passe through all ROADMs in loop): 60 (DWDM Channel C60) 1529,55 nm 196,00 Thz with frequency range [195.95,196.05] Thz
+
+=== MUX/DEMUX configuration ===
+
+* ROADM 4:
+        DEMUX IN/OUT port: 5101/5204
+        MUX IN/OUT port: 4104/4201
+* ROADM 1:
+        DEMUX IN/OUT port: 5101/5201
+        MUX IN/OUT port: 4101/4201
+* ROADM 2:
+        DEMUX IN/OUT port: 5101/5201
+        MUX IN/OUT port: 4101/4201
+* ROADM 3:
+        DEMUX IN/OUT port: 5101/5204
+        MUX IN/OUT port: 4104/4201
+
+=== ALS Disable Sequence (for 60 seconds) ===
+
+1. ROADM 4 booster, 
+2. ROADM 2 booster, 
+3. ROADM 3 booster, 
+4. ROADM 1 booster, 
+
+== Setting “Experiment_1” Connections ==
+
+=== Configuring ToR1<->ToR2 Connection 1 ===
+
+* ROADM 4:
+1. Enable MUX port 4102 “From ToR 1” 
+2. Add Connection “Exp1-FromTor1” with Input/ Output Port 4102/4201 with bandwidth [192.95;193.05] (python add_connection.py 10.104.1.4 1 10 in-service false 4102 4201 192950 193050 5 Exp1-FromTor1)
+3. Enable DEMUX port 5202 “Towards ToR 1”
+4. Add Connection “Exp1-TorwardTor1” with I/O Port 5101/5202 (python add_connection.py 10.104.1.4 2 10 in-service false 5101 5202 192950 193050 5 Exp1-TorwardTor1)
+* ROADM 1:
+5. Enable MUX port 4102 “From ToR 2” 
+6. Add Connection “From ToR 2” with I/O Port 4102/4201 with bandwidth [192.95;193.05] 
+7. Enable DEMUX port 5202 “Towards ToR 2”
+8. Add Connection “Towards ToR 2” with I/O Port 5101/5202
+
+=== Configuting ToR1<->ToR3 Connection 2 ===
+
+* ROADM 4 (Same As For Connection 1):
+1. Enable MUX port 4102 “From ToR 1” 
+2. Add Connection “From ToR 1” with I/O Port 4102/4201 with bandwidth [192.95;193.05] 
+3. Enable DEMUX port 5202 “Towards ToR 1”
+4. Add Connection “Towards ToR 1” with I/O Port 5101/5202 with bandwidth [192.95;193.05] 
+* ROADM 1 <Not Same!>:
+5. Enable MUX port 4101 “Through Port” (enabled for Snake)
+6. Add Connection “Through In” with I/O Port 4101/4201 with bandwidth [192.95;193.05] 
+7. Enable DEMUX port 5201 “Through Port” (enabled for Snake)
+8. Add Connection “Through Out” with I/O Port 5101/5201 with bandwidth [192.95;193.05]
+* ROADM 2 (Same As For ROADM1):
+9. Enable MUX port 4101 “Through Port” (enabled for Snake)
+10. Add Connection “Through In” with I/O Port 4101/4201 with bandwidth [192.95;193.05] 
+11. Enable DEMUX port 5201 “Through Port” (enabled for Snake)
+12. Add Connection “Through Out” with I/O Port 5101/5201 with bandwidth [192.95;193.05]
+* ROADM 3 (Same As For ROADM4):
+13. Enable MUX port 4102 “From ToR 3” 
+14. Add Connection “From ToR 3” with I/O Port 4102/4201 with bandwidth [192.95;193.05] 
+15. Enable DEMUX port 5202 “Towards ToR 3”
+16. Add Connection “Towards ToR 3” with I/O Port 5101/5202 with bandwidth [192.95;193.05] 
+
+----
+
+= Network Interfaces Configuration for Experiment_1 =
+== Setting Up ToR switch with 3 logical ToR switches == 
+1. Preparing the interfaces to be set as VLAN switch ports:
+
+{{{
+sw-tor-lg1#configure
+sw-tor-lg1(conf)#interface twentyFiveGigE 1/1/1
+sw-tor-lg1(conf-if-tf-1/1/1)#switchport
+sw-tor-lg1(conf-if-tf-1/1/1)#no shutdown
+sw-tor-lg1(conf-if-tf-1/1/1)#exit
+sw-tor-lg1(conf)#interface twentyFiveGigE 1/1/2
+sw-tor-lg1(conf-if-tf-1/1/2)#switchport
+sw-tor-lg1(conf-if-tf-1/1/2)#no shutdown
+sw-tor-lg1(conf-if-tf-1/1/2)#exit
+sw-tor-lg1(conf)#interface twentyFiveGigE 1/1/3
+sw-tor-lg1(conf-if-tf-1/1/3)#switchport
+sw-tor-lg1(conf-if-tf-1/1/3)#no shutdown
+sw-tor-lg1(conf-if-tf-1/1/3)#exit
+sw-tor-lg1(conf)#interface tengigabitethernet 1/31/1
+sw-tor-lg1(conf-if-te-1/31/1)#switchport
+sw-tor-lg1(conf-if-te-1/31/1)#no shutdown
+sw-tor-lg1(conf-if-te-1/31/1)#exit
+sw-tor-lg1(conf)#interface tengigabitethernet 1/29/1
+sw-tor-lg1(conf-if-te-1/29/1)#switchport
+sw-tor-lg1(conf-if-te-1/29/1)#no shutdown
+sw-tor-lg1(conf-if-te-1/29/1)#exit
+sw-tor-lg1(conf)#interface tengigabitethernet 1/32/1
+sw-tor-lg1(conf-if-te-1/32/1)#switchport
+sw-tor-lg1(conf-if-te-1/32/1)#no shutdown
+sw-tor-lg1(conf-if-te-1/32/1)#exit
+}}}
+
+2. Assigning interfaces to VLANs
+
+{{{
+sw-tor-lg1#configure
+sw-tor-lg1(conf)#interface vlan 121
+sw-tor-lg1(conf-if-vl-121)#untagged twentyFiveGigE 1/1/1
+sw-tor-lg1(conf-if-vl-121)#untagged tengigabitethernet 1/32/1
+sw-tor-lg1(conf-if-vl-121)#exit
+sw-tor-lg1(conf)#interface vlan 122
+sw-tor-lg1(conf-if-vl-122)#untagged twentyFiveGigE 1/1/2
+sw-tor-lg1(conf-if-vl-122)#untagged tengigabitethernet 1/29/1
+sw-tor-lg1(conf-if-vl-122)#exit
+sw-tor-lg1(conf)#interface vlan 123
+sw-tor-lg1(conf-if-vl-123)#untagged twentyFiveGigE 1/1/3
+sw-tor-lg1(conf-if-vl-123)#untagged tengigabitethernet 1/31/1
+sw-tor-lg1(conf-if-vl-123)#exit
+sw-tor-lg1(conf)#exit
+}}}
+
+3. Assigning a wavelength to transceivers:
+
+{{{
+sw-tor-lg1#configure
+sw-tor-lg1(conf)#interface tengigabitethernet 1/32/1
+sw-tor-lg1(conf-if-te-1/32/1)#wavelength 1553.3
+sw-tor-lg1(conf-if-te-1/32/1)#exit
+sw-tor-lg1(conf)#interface tengigabitethernet 1/29/1
+sw-tor-lg1(conf-if-te-1/29/1)#wavelength 1553.3
+sw-tor-lg1(conf-if-te-1/29/1)#exit
+sw-tor-lg1(conf)#interface tengigabitethernet 1/32/1
+sw-tor-lg1(conf-if-te-1/32/1)#wavelength 1553.3
+sw-tor-lg1(conf-if-te-1/32/1)#exit
+sw-tor-lg1(conf)#exit
+}}}
+
+4. Verify VLANs:
+
+{{{
+sw-tor-lg1#show vlan
+
+Codes: * - Default VLAN, G - GVRP VLANs, R - Remote Port Mirroring VLANs, P - Primary, C - Community, I - Isolated
+       O - Openflow, Vx - Vxlan
+Q: U - Untagged, T - Tagged
+   x - Dot1x untagged, X - Dot1x tagged
+   o - OpenFlow untagged, O - OpenFlow tagged
+   G - GVRP tagged, M - Vlan-stack
+   i - Internal untagged, I - Internal tagged, v - VLT untagged, V - VLT tagged
+
+    NUM    Status    Description                     Q Ports
+    121    Active                                    U Te 1/32/1
+                                                     U Tf 1/1/1
+    122    Active                                    U Te 1/29/1
+                                                     U Tf 1/1/2
+    123    Active                                    U Te 1/31/1
+                                                     U Tf 1/1/3
+
+}}}
+
+== Configuring Compute Nodes (Servers srv1..3-lg1) ==
+
+1. Install net-tools:
+
+{{{#!shell-session
+sudo apt install net-tools
+}}}
+
+2. Configure interfaces eo1 and assign IP addresses:
+
+{{{#!shell-session
+native@srv1-lg1:~$ sudo ifconfig eno1 192.168.1.1 netmask 255.255.255.0
+native@srv2-lg1:~$ sudo ifconfig eno1 192.168.1.2 netmask 255.255.255.0
+native@srv3-lg1:~$ sudo ifconfig eno1 192.168.1.3 netmask 255.255.255.0
+}}}
+
+
+----
+= Perform Experiment_1 =
+
+1. Establish Connection ToR1<->ToR2.
+2. Try Ping from Srv1 to Srv2:
+
+{{{#!shell-session
+native@srv1-lg1:~$ ping 192.168.1.3
+PING 192.168.1.3 (192.168.1.3) 56(84) bytes of data.
+64 bytes from 192.168.1.3: icmp_seq=1 ttl=64 time=0.460 ms
+64 bytes from 192.168.1.3: icmp_seq=2 ttl=64 time=0.423 ms
+}}}
+
+3. Establish Connection ToR1<->ToR2.
+4. Try Ping from Srv1 to Srv3.