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Showing posts from May, 2011

Break the Network Emulators out of the Cloud

Cisco IOU and JunoSphere
Recently both Cisco and Juniper have announced the availability of online resources to provide hands on training over the internet. They have built software emulators in the cloud that can be accessed remotely for a cost. These solutions are based purely around the certification programs and therefore are pretty rigid in the topology that are provided, not to mention the re-occurring cost.
Rack Rentals
There are training providers such as Internetwork Expert ( and IPexpert ( who provide rack rentals based on their training materials. These guy cannot possibly compete going forward. To keep these sustainable they will need to reduce the overhead of building physical racks, providing power and space for the racks. Using emula…

Weird CatOS to IOS Trunk Problem – Cannot Ping

I was setting this very basic configuration up the other evening and could not get basic L3 connectivity up and running.

I have a ASR 1002 on one side and an Catalyst 6509 running Hybrid CATOS and IOS. The configuration is basically to connect two devices for routing using 802.1q vlans. Here is the configs, but I cannot ping between the devices.

interface GigabitEthernet0/0/2
no ip address
negotiation auto
interface GigabitEthernet0/0/2.700
encapsulation dot1Q 700
ip address
ip ospf network point-to-point

6509 – Switch

set vlan 700   3/3
clear trunk 3/3  1-699,701-1005,1025-4094
set trunk 3/3  on dot1q 700
set spantree portfast    3/3 enable trunk

6509 - MSFC

interface Vlan700
ip address
ip ospf network point-to-point

I could not see any issue, so to confirm try and establish if it was some trunking issue, I remove the trunk and used the main interface on the ASR1000 and access port to vlan on the 6509 and I could ping between th…