Category Archives: CCNP

Access-list mask or wildcard

G’day all, today I was messing around with access-list.  And after getting my head around the weird subnets of rfc1918. Weird as in an A-class (/8) is reserved in A-space, B-class (/16) in reserved in C-space, and for the B-space … Continue reading

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Policy Based Routing

Policy-Based routing is a neat trick to tweak traffic streams. For Policy Based Routing to work you will the following; – Define traffic stream in an access-list. – Write down a policy. – Determine the inbound interface. First use an … Continue reading

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Error-Disable

When a network port encounters an error. This port is automatically shutdown to ensure network stability. When error-disable is enabled. The predefined error are as follows; arp-inspection bpduguard channel-misconfig dhcp-rate-limit              gbic-invalid                 l2ptguard                   link-flap mac-limit link-monitor-failure loopback oam-remote-failure pagp-flap port-mode-failure psecure-violation … Continue reading

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SSH error on cisco router

Enabling SSH on a Cisco router is not enough to guarantee SSH is working. Enabling ssh version 2.0 on a routers is as straight forward as;. >ip ssh version 1-2 I surely recommend the use of version 2, because ssh … Continue reading

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DHCP Helper address

Which source ip address is used when relaying a dhcp-request ? Continue reading

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Extended IP Access-list

As we all have learned in our pursuit to CCNA there are many different types of access-list. In reality most commonly used are ip access lists. Major difference between ip standaard access-list an ip extended access-list is the ability to … Continue reading

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Cisco Express Forwarding

Differences between IP CEF , fast forwaring and processor based forwarding. Continue reading

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