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Archive for December, 2009
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.
Router On A Stick Tutorial
Dec 12th
Someone asked me about configuring a router on a stick yesterday, so I figured I’d make a short tutorial on it. I haven’t seen this used much in the real world as L3 switches are so common, but it is something I had to learn for the CCNA. Router on a stick is used when for inter-VLAN routing when you have an L2 switch and a router. Here’s the topology:
Here we have an L2 switch with three VLANs connected to a router. Here’s the config:
Switch
Switch(config)#vlan 5 Switch(config-vlan)#exit Switch(config)#vlan 10 Switch(config-vlan)#exit Switch(config)#vlan 15 Switch(config-vlan)#exit Switch(config)#interface FastEthernet0/1 Switch(config-if)#switchport trunk encapsulation dot1q Switch(config-if)#switchport mode trunk |
The switch config is pretty basic, we create VLANs 5, 10 and 15, then we make a trunk port to the router.
Router
Router(config)#interface FastEthernet0/0 Router(config-if)#no ip address Router(config-if)#interface FastEthernet0/0.5 Router(config-subif)#encapsulation dot1Q 5 Router(config-subif)#ip add 192.168.5.1 255.255.255.0 Router(config-subif)#interface FastEthernet0/0.10 Router(config-subif)#encapsulation dot1Q 10 Router(config-subif)#ip add 192.168.10.1 255.255.255.0 Router(config-subif)#interface FastEthernet0/0.15 Router(config-subif)#encapsulation dot1Q 15 Router(config-subif)#ip add 192.168.15.1 255.255.255.0 |
On the router, we go to the interface connected to the switch and make sure there is no IP address. Then we configure our subinterfaces with 802.1q and the appropriate VLAN. Then we give each subinterface an IP address. Now we can see all the subinterfaces are up:
MPLS and BGP Lab Guide, Part 3
Dec 9th
This is the third 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.
MPLS and BGP Lab Guide, Part 2
Dec 7th
This is the second 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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