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Archive for December, 2009
MPLS and BGP Lab Guide, Part 6
Dec 31st
This is the sixth post in the series, the goal of the series is to provide a guide for the MPLS and BGP Lab I posted awhile back. The labs consists of MPLS VPNs and BGP along with some OSPF, NAT, IPSEC and GRE exposure. I will be posting the files needed for this lab at the bottom. Here’s the topology and the requirements:
(click image for fullsize)
Requirements:
Internet
* The two Internet routers should serve as transit ASes. No other routers should permit transit traffic.
* Internet sites (modeled by loopbacks) should be accessible by all lan IPs.
RSS Was Broken
Dec 30th
Last week I noticed that my RSS subscriber numbers had dropped by about 50%. This made me sad, and I thought maybe Feedburner was having issues, but it hadn’t occurred to me that it was something on my end as I’d made no changes. Well it turns out something happened with my theme and it killed the RSS feed.
So anyway, it’s fixed now and I hope it’s working for everyone.
TCL Ping Script
Dec 29th
TCL is a scripting language built into IOS (since 12.3(2)T according to Cisco.com), it can be very handy. I use this TCL script quite a bit, but it’s always few and far between, so I find myself Googling for it every time. I decided to post it here so I always know where to find it, heh. This TCL script it pretty basic, you just type it out in a text editor and past it in the console.
Here’s a simple example:
foreach address {
192.168.10.1
192.168.15.1
192.168.25.1} { ping $address } |
With that we get this:
EDGE#tclsh
EDGE(tcl)#foreach address {
+> 192.168.10.1
+> 192.168.15.1
+> 192.168.25.1} { ping $address }
Type escape sequence to abort.
Sending 5, 100-byte ICMP Echos to 192.168.10.1, timeout is 2 seconds:
!!!!!
Success rate is 100 percent (5/5), round-trip min/avg/max = 1/3/4 ms
Type escape sequence to abort.
Sending 5, 100-byte ICMP Echos to 192.168.15.1, timeout is 2 seconds:
!!!!!
Success rate is 100 percent (5/5), round-trip min/avg/max = 1/3/4 ms
Type escape sequence to abort.
Sending 5, 100-byte ICMP Echos to 192.168.25.1, timeout is 2 seconds:
!!!!!
Success rate is 100 percent (5/5), round-trip min/avg/max = 1/3/8 ms |
We could get a bit more complex using some extended ping options, like this:
foreach address {
192.168.10.1
192.168.15.1
192.168.25.1} { ping $address source lo254 repeat 3 } |
In this one we are pinging with a source address of Loopback 254, and only sending 3 pings. It looks like this:
EDGE#tclsh
EDGE(tcl)#foreach address {
+> 192.168.10.1
+> 192.168.15.1
+> 192.168.25.1} { ping $address source lo254 repeat 3 }
Type escape sequence to abort.
Sending 3, 100-byte ICMP Echos to 192.168.10.1, timeout is 2 seconds:
Packet sent with a source address of 192.168.254.254
!!!
Success rate is 100 percent (3/3), round-trip min/avg/max = 1/3/4 ms
Type escape sequence to abort.
Sending 3, 100-byte ICMP Echos to 192.168.15.1, timeout is 2 seconds:
Packet sent with a source address of 192.168.254.254
!!!
Success rate is 100 percent (3/3), round-trip min/avg/max = 1/3/8 ms
Type escape sequence to abort.
Sending 3, 100-byte ICMP Echos to 192.168.25.1, timeout is 2 seconds:
Packet sent with a source address of 192.168.254.254
!!!
Success rate is 100 percent (3/3), round-trip min/avg/max = 1/3/4 ms |
Short post, just something I needed a place for. Hope it’s useful to some readers.
Happy Holidays
Dec 25th
If you’re celebrating any holiday right now, I hope you’re enjoying it! Christmas here, didn’t get any Cisco toys though.:(
MPLS and BGP Lab Guide, Part 5
Dec 22nd
This is the fifth post in the series, the goal of the series is to provide a guide for the MPLS and BGP Lab I posted awhile back. The labs consists of MPLS VPNs and BGP along with some OSPF, NAT, IPSEC and GRE exposure. I will be posting the files needed for this lab at the bottom. Here’s the topology and the requirements:
(click image for fullsize)
Requirements:
Internet
* The two Internet routers should serve as transit ASes. No other routers should permit transit traffic.
* Internet sites (modeled by loopbacks) should be accessible by all lan IPs.
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