On live monitoring of routing table changes during vty session:
1. Set logging level to debugging for vty sessions
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Routing table troubleshoot
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Full mesh formula
How to count how much connections we need to build a full mesh ?
x = n*(n-1)/2
- x – number of connections
- n – number of devices
example for 5 devices:
we need:
5*(5-1)/2 = 5*4/2 = 20/2 = 10
connections to build a full mesh beetween them.
CBWFQ Inside GTS
On Cisco router platform, we can easily divide interface downstream bandwidth between two or more Customers and simultanously guarantee(prioritize or limit) its amount for definded queues.
Lets take example with two Customers : Continue reading
FHRP—Enhanced Object Tracking of IP SLAs Operations
Today – I would like to present very useful Cisco IOS feature – FHRP—Enhanced Object Tracking of IP SLAs Operations – is an extension of traditional object tracking (eg. interface tracking). Very basic example of using it, is removing of static route from routing table if specified IP address is not reachable.
1. Creating SLA probe number 1, defining SLA action type and destination, parameters for threshold and timeout for 2seconds, frequency for 5seconds Continue reading
Regular expressions on IOS
Some play with IOS command line and regular expressions:
1. showing of every line from running-configuration which inculdes IP address:
sh run | inc [0-9].[0-9].[0-9].[0-9]