Archive for the ‘Lab Solutions’ category

Count on CDP

August 1, 2006

This might come in handy some day

Do you want to police route a packet, but you want to make sure the next-hop actually works before you send any policed traffic?

I just happened to come across something like that, and it’s on UniverCD

What you want is to see your next-hop on your CDP neighbors table (To ensure is “Available”)

Your route-map should look something like this

R2(config)#route-map COUNT-VON-COUNT
R2(config-route-map)#match ip address POLICED-TRAFFIC
R2(config-route-map)#set ip next-hop
R2(config-route-map)#set ip next-hop verify-availability
R2(config)#ip local policy route-map COUNT-VON-COUNT

This should get traffic to behave accordingly

Count on it count von count Muajajajajaa
Release 12.4 / Configuration Guides / Routing Protocols Configuration Guide / Protocol-Independent Routing / Configuring IP Routing Protocol-Independent Features / Enabling NetFlow Policy Routing



July 26, 2006

NAT with Redundancy:

Go to Release 12.4 -> Configuration Guides -> IP Application Services Configuration Guide -> First-Hop Redundancy Protocols -> Configuring HSRP -> Linking IP Redundancy Clients to HSRP Groups

A Few Random UniverCD Links…

July 26, 2006

XML syslog:

Go to Release 12.4 -> Configuration Guides -> Network Management Configuration Guide -> System Monitoring and Logging -> XML Formatted System Logging Messages (XML Interface to syslog Messages)

Remember all those MIB groups for SNMP?

show snmp mib

questionmark.jpgUsing ‘?’ as a character:

Go to Release 12.4 -> Configuration Guides -> Terminal Services Configuration Guide -> Appendixes -> Regular Expressions

Scroll down to the additional information on the question mark!

Extended access lists as prefix-lists

July 13, 2006

A while back, Jason came across a funny looking extended access list, which contained a subnet mask as the destination address. This is not the one he came across, but an example using the same concept:

ip access-list 101 permit ip host host

This may look strange at first, but it is actually not that complicated. When this is used in a route-map for filtering routes (with an application such as BGP) the source address becomes the route network and the destination address becomes the subnet mask (Doyle, V.II 190).


A Long FAT Network

July 13, 2006

At first I could not belive this myself, but it is true, long FAT networks are lurking arround.

Fatty networks are the ones with high levels of choresterol 😛 Just kidding.

This is just one of those things that I had to see for myself, AND because is a LONG FAT NETWORK wasn’t really hard to spot. 😀

I know, I know it’s a lot of buzz for just ONE command. (But could be worth 6 points!)

Here it is found:

IOS Release 12.4 / Configuration Guides / Application Services / TCP / TCP Window Scaling / Setting The TCP Window Size

Ping !!!!! From the trenches

July 12, 2006

helmet_side1.pngWe’re on a war with these labs and were going to ping them down !!!!!

When you have a device that doesn’t support TCL scripts don’t let your guard down when testing for connectivity. !!!!!

Enable rsh on the old router/switch and use a rsh command on your TCL script…


In case you forgot this is the link to the configuration library commands for RCMD


Friday Lab Recap

July 11, 2006

OK, so you couldn’t find RCMD in UniverCD during Friday’s practice exam. Neither could I. Here’s the link:

Go to 12.4 -> Command References -> Configuration Fundamentals Command Reference -> ip ftp password through logout-warning

Look for the ip rcmd … commands.
System groups and SNMP?

Go to 12.4 -> Command References -> Network Management Command Reference -> snmp-server enable traps cpu through xsm vdm

Look for the snmp-server view command and the examples.

Redirecting telnet sessions to a VTY line on another router?

Make sure you use the rotary command on the VTY line that you want to execute the redirection.

All these excellent links make you want to shout, “GLORY!”