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Colby
Colby Glass has been in IT since 2002. He is currently a network engineer with a large Cisco partner and holds the CCNP, CCDP, CCIP, CCNA: Voice, CCNA, JNCIA-ER and ITILv3: Foundations certifications. He has also passed the CCIE R&S Written exam and is studying for the Lab exam.
Posts by Colby
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.
Got A New Toy
Dec 20th
We had two 7204VXRs at work that have been sitting on a shelf for a couple years. I figured I could actually put one of them to use, so I cleared it with the guys and brought it home.
Specs:
Cisco 7204VXR (NPE225) processor (revision A) with 245760K/16384K bytes of memory. Processor board ID 31649069 R527x CPU at 262MHz, Implementation 40, Rev 10.0, 2048KB L2 Cache 4 slot VXR midplane, Version 2.7 Number of Fast PAs = 1 Number of Fast+Medium PAs = 1 Total number of PA bandwidth points consumed = 200 2 FastEthernet interfaces 125K bytes of NVRAM. 47040K bytes of ATA PCMCIA card at slot 0 (Sector size 512 bytes). 8192K bytes of Flash internal SIMM (Sector size 256K). |
So far I’m loving this thing. I have it at my edge, it’s running CME and some GRE/IPSEC tunnels (PeerIX stuff), along with heavy QoS. Not surprisingly, it handles all this with ease.
If anyone knows of a good deal on an NPE-400 please let me know.
MPLS and BGP Lab Guide, Part 4
Dec 16th
This is the fourth 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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