Saturday, December 27, 2014

Huawei and Cisco – Connect eNSP to GNS3 (Simulators)

Huawei eNSP (Enterprise Network Simulation Platform) is a network simulator developed by Huawei and freelly available. eNSP use Oracle Virtual Box (bundled within the eNSP installer), where each device is emulated from a single Virtual Box VM. eNSP uses a GUI to create and manage devices so no Virtual Box knowledge is needed.

Below we are going to show how to connect eNSP (v1.2.00.330) with GNS3 (v1.2.1), so that the equipments in both simulators can comunicate with each other.

Setting Up eNSP (Huawei Simulator)


Two interfaces must be added:

  • Ethernet Internal (UDP) port: used between eNSP GUI and Virtual Box ASR2 instance;
  • Ethernet Public port: used between eNSP GUI and the GNS3

Both interfaces must implement (Port Mapping) a Two-way Channel.











Setting Up GNS3 (Cisco Simulator)









Now just configure GE0/0/0 on AR2 (eNSP) and Fa0/0 on R1 (GNS3) on the same subnet and start pinging.

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Friday, December 5, 2014

Cisco – IP SLA Basics



IP SLA is a function of Cisco’s IOS enabling you to analyze a Service Level Agreement (SLA) for an IP application or service. IP SLAs use active traffic-monitoring to continuously monitor traffic across the network. This is very different from SNMP or Netflow data which give you more volume oriented statistics. Many different metrics can be analyzed using IP SLA, here is a break down of a few.

  • UDP Jitter – Probably the most used operation in all of IP SLA. This IP SLA generates UDP traffic and measures Round-trip Delay, One-way Delay, One-way Jitter, One-way Packet Loss, and overall Connectivity.
  • ICMP Path Jitter – Hop-by-hop Jitter, Packet Loss, and Delay.
  • UDP Jitter for VoIP – Enhanced test for VoIP monitoring. It can simulate various codecs and spits out voice quality scores (MOS, and ICPIF). Also shows us Round-trip Delay, One-way Delay, One-way Jitter, and One-way Packet Loss.
  • UDP Echo – Round-trip Delay for UDP traffic.
  • ICMP Echo – Round-trip Delay, full path.
  • ICMP Path Echo – Round-trip Delay and Hop-by-hop round trip delay.
  • HTTP – Round-trip time using simulated http traffic.
  • TCP Connect – Allows us to sample the time to connect to a target using TCP.
  • FTP – Round-trip time for file transfers.
  • DHCP – Round-trip time for dynamic host configuration.
  • Frame-Relay –Round-trip Delay, and the Frame Delivery Ratio. Mostly used for circuit availability.

IP SLA Configuration

There are 2 parts to the IP SLA configuration. Our testing source, and the responder. Typically our responder is a device local to the data center, while the test host is device at a remote site. The test host sends data to the responder and the responder sends a reply back. The configuration for the responder is nothing but really, really simple…

ip sla responder

Seriously. Now lets take a look at the configuration of the testing source. Any questions I don’t answer here should be easily available via IOS context help… Here is an example I’m using in production.

ip sla 10 ! New IP SLA Instance #10
udp-jitter 16800 source-ip codec g711ulaw ! udp jitter w/Voice codec
tos 184 ! TOS bit, using EF here
frequency 300 ! testing interval

ip sla schedule 10 life forever start-time now ! start now, never stop

So, what does this get us? Here are the stats output by our IP SLA source..

Router#sh ip sla statistics 10 ! Omit the # to view all SLA stats.
IPSLAs Latest Operation Statistics

IPSLA operation id: 10
Type of operation: udp-jitter
    Latest RTT: 42 milliseconds
Latest operation start time: 18:28:06.603 UTC Thu May 5 2011
Latest operation return code: OK

RTT Values:
    Number Of RTT: 1000 RTT Min/Avg/Max: 39/42/154 milliseconds
Latency one-way time:
    Number of Latency one-way Samples: 1000
    Source to Destination Latency one way Min/Avg/Max: 25/26/41 milliseconds
    Destination to Source Latency one way Min/Avg/Max: 13/15/127 milliseconds

Jitter Time:
    Number of SD Jitter Samples: 999
    Number of DS Jitter Samples: 999
    Source to Destination Jitter Min/Avg/Max: 0/2/15 milliseconds
    Destination to Source Jitter Min/Avg/Max: 0/2/90 milliseconds

Packet Loss Values:
    Loss Source to Destination: 0 Loss Destination to Source: 0
    Out Of Sequence: 0 Tail Drop: 0
    Packet Late Arrival: 0 Packet Skipped: 0
Voice Score Values:
Calculated Planning Impairment Factor (ICPIF): 1

MOS score: 4.34
Number of successes: 7
Number of failures: 0

Operation time to live: Forever


Cisco’s IP SLA features can be a huge benefit to any engineer trying to track down issues on the network. Using IP SLA in combination with a SNMP management suite, or even an EEM script can provide real time alerting for adverse network conditions, allowing you to respond faster and perform better.

Author: Tony Mattke

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