- Laptop boots up for the first time and requests an IP address.
- Laptop’s IP address lease is renewed.
- Laptop reboots and confirms the IP address settings
- Laptop is disconnected from Subnet 1 and reconnected in Subnet 3.
BGP peering and route update messaging is explored in detail in this flow.
This message flow shows how two BGP routers:
- Peer by establishing a TCP connection and exchanging BGP OPEN messages.
- Exchange Keep Alive messages to ensure that the routers are reachable.
- Exchange routes using BGP UPDATE messages.
- Release the BGP connection on operator command.
VisualEther 6.1.103 now supports generating sequence diagrams from tunneled messages in PCAP files. You can create filters that will ignore the outer GTP message and extract the fields from the inner message.
This call flow shows the SIP call setup between a SIP client (192.168.0.10) and a SIP server (184.108.40.206). The flow also shows the RTP message flow between the SIP client and the Media Gateway (220.127.116.11).
The example covers the following:
- SIP invite from the client.
- The SIP server challenges the client to authenticate.
- The client responds to the authentication challenge.
- The call is connected.
- The call enters the conversation phase with RTP traffic.
- The SIP call is cleared.
This sequence diagram covers the establishment of a SSL/TLS connection for sending Google SPDY data. The protocol flow covers:
Voice over LTE (VoLTE) is the standard for voice call setup in LTE networks. When VoLTE is deployed, phones will not need to fallback to 3G for voice calls.
VoLTE uses IMS SIP signaling to set up voice calls. The following VoLTE call flow describes the IMS call setup and release. An example of sending an SMS over IMS is also included. Sample RTP and RTCP messages are also shown in the flow.
The Border Gateway Protocol (BGP) is an inter-autonomous system routing protocol. An autonomous system is a group of networks under common administrative control and routing policies.
This sequence diagram describes the sequence of messages exchanged when a new BGP router is made operational. The steps involved are:
- Establish TCP connections
- Exchange BGP Open messages.
- Start periodic exchange of Keepalive messages.
- Exchange routing information with the BGP Update message.