Documentation updated

docs/BUILD_IMAGE.md

@@ -5,7 +5,7 @@ $ git clone https://gitlab.eurecom.fr/oai/cn5g/oai-cn5g-upf-vpp.git
 
 $ cd oai-cn5g-upf-vpp
 
-$ git checkout vpp-upf
+$ git checkout develop
 ```
 
 # 2. Generic Parameters #

docs/INSTALL_ON_HOST.md

 
-# VPP-UPF Installation
+# VPP-UPF Native Installation
 
 Tested and validated on Ubuntu Bionic arch amd64.
 
@@ -10,7 +10,7 @@ $ git clone https://gitlab.eurecom.fr/oai/cn5g/oai-cn5g-upf-vpp.git
 
 $ cd oai-cn5g-upf-vpp
 
-$ git checkout vpp-upf
+$ git checkout develop
 ```
 
 ## Install VPP-UPF

docs/VPP_NETWORKING.md

  <br/>
  <br/>
  <br/>
- // Describe VPP usage with veth pair and requirement of three veth pair/linux interfaces.<br/>
- <br/>
-UPF sould have at least three interfaces viz. access, core and sgi (or N3, N4 and N6/N9 respectively).<br/>
-Here I have three interfaces to docker container. We rename them just for sec of simplicity. There is <br/>
-additional route added for UE traffic 10.10.10.0/24 network <br/>
+
+UPF sould have at least three host or veth interfaces for viz. access, core and sgi (or N3, N4 and N6/N9 respectively).
+Here we have three interfaces to docker container. We rename them just for sec of simplicity. There is
+additional route added for UE traffic 10.10.10.0/24 network via sgi interface as gateway.<br/>
  <br/>
+ Below is sample interfaces configuration for host machine/container -
  <br/>
 
 ```bash
@@ -24,8 +24,8 @@ ip link set sgi up
 
 ip route add 10.10.10.0/24 via 192.168.63.198 dev sgi
 
+ip route add 192.168.61.0/24 dev core 
 ip route add 192.168.62.0/24 dev access
-ip route add 192.168.61/24 dev core 
 ip route add 192.168.63.0/24 dev sgi 
 ```
 

docs/VPP_UPF_CONFIG.md

  <br/>
  <br/>
  <br/>
-Below is sample vpp-upf configuration. We use at lease three veth-pairs as UPF interfaces (e.g. N3, N4, N6/N9 etc). <br/>
+We need create/use a host interface that will attach to a linux AF_PACKET interface, one side of a veth pair. The veth pair or host interaface must already exist. Once created, a new host interface will exist in VPP with the name &#39;<em>host-<ifname></em>&#39;, where &#39;<em><ifname></em>&#39; is the name of the specified veth pair. Use the &#39;<em>show interface</em>&#39; command to display host interface details. <br/>
  <br/>
+Below is sample vpp-upf configuration. We use at least three veth-pairs as UPF interfaces (e.g. N3, N4, N6/N9 etc). <br/>
  <br/>
 
+
 ```bash
 ip table add 1
 ip table add 2
@@ -12,19 +14,19 @@ ip table add 2
 ####### Create N4 interface
 create host-interface name core
 set interface ip table host-core 0
-set interface ip address host-core 192.168.61.201/26
+set interface ip address host-core 192.168.61.201/24
 set interface state host-core up
 
 ####### Create N3 interface
 create host-interface name access
 set interface ip table host-access 1
-set interface ip address host-access 192.168.62.201/26
+set interface ip address host-access 192.168.62.201/24
 set interface state host-access up
 
 ####### Create N6 interface
 create host-interface name sgi
 set interface ip table host-sgi 2
-set interface ip address host-sgi 192.168.63.201/26
+set interface ip address host-sgi 192.168.63.201/24
 set interface state host-sgi up
 
 ####### Add ip routes