Junos Cup 2014
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Junos Cup 2014

Tournament 4: Ghana Challenge & Solution: Ping on Aggregated Ethernet

[ Edited ]
‎07-03-2014 07:14 AM

Country Flag: GHANA

 

Author: Antonio Sánchez Monge

 

Title: Ping on Aggregated Ethernet

 

Type: Enterprise

 

Difficulty: High (2 points).

 

Technical Description: Use ping to health-check a Gigabit Ethernet link that is part of an Aggregated Ethernet bundle.

 

Topology:

 

Ghana-Topology

Challenge Instructions:

For this challenge, you need to start the topology called: “GHANA – Ping on Aggregated Ethernet”.

 

As an Engineer in the Operations department, you have been requested to troubleshoot the link ge-0/0/2, and perform a ping operation of 100 packets, sized around 1000 bytes. These packets must cross the ge-0/0/2 link in a deterministic manner. The 100 packets from R1D1 to R2D2 should go through ge-0/0/2, as well as the replies, too.

 

The operation should not be disruptive –– the links should neither flap nor go down as a result of your troubleshooting.

 

You are allowed to change the configuration of the devices, but you should NOT touch the [edit interfaces] configuration, neither directly nor via configuration groups or alike. You are not allowed to execute shell commands either.

 

To solve this challenge provide the sequence of configurations and at which router they are set.

 

OFFICIAL SOLUTION:

 

At R1D1:

 

admin@R1D1# set protocols oam ethernet connectivity-fault-management maintenance-domain testMD level 0 maintenance-association testMA mep 1 direction down interface ge-0/0/2

 

At R2D2:

 

admin@R2D2# set protocols oam ethernet connectivity-fault-management maintenance-domain testMD level 0 maintenance-association testMA mep 2 direction down interface ge-0/0/2

 

 

Once the above configurations are committed, you execute at R2D2 “show interfaces ge-0/0/2” so as to find its <mac-address>. Then:

 

juniper@R1D1> ping ethernet <mac-address> maintenance-association testMA maintenance-domain testMD

 

This ping succeeds and, not only that, it uses interface ge-0/0/2.

Julie Wider
Advocacy Manager
Twitter: @JNetCommunity & @jawider