CCIE Jobs – Metro NY area CCIE jobs – USPosted by Peter Kurdziel on October 30, 2008
To specify a backdoor route to a Border Gateway Protocol (BGP) border router that provides better information about the network, use the network backdoor command in address family or router configuration mode. To remove an address from the list, use the no form of this command.
network address backdoor
no network address backdoor
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Posted by Peter Kurdziel on October 29, 2008
I fell asleep. 2 cups of strong coffee and still sleepy.
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Posted by Peter Kurdziel on October 27, 2008
OSPF – configure a router-id
The route will select the hightest loopback address. If there are no loopbacks OSPF will assign the highest physical interface’s IP as the router id.
Always statically nail down the router-id.
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Posted by Peter Kurdziel on October 26, 2008
sho ip bgp sum | b ^Nei
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Posted by Peter Kurdziel on October 26, 2008
BGP path manipulation
Why laugh at me?
| Method | Direction Applied | Direction Affected | Best Metric |
| Weight | Inbound | Outbound | Highest |
| Local Preference | Inbound | Outbound | Highest |
| AS Path | Outbound | Inbound | Shortest |
| MED (metric) | Outbound | Inbound | Lowest |
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Posted by Peter Kurdziel on October 26, 2008
Clear text is done under the inteface.
MD5 is done under the interface and under the routing process. OSPF supports multiple keys under a single interface for key rotation.
Don’t forget the virtual-links!
If a new router is added and you don’t want it to require authentication add IP OSPF AUTHENTICATION NULL under the interface.
FYI, authentication type configured at the interface level overrides the authentication type configured at the process level.
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Posted by Peter Kurdziel on October 26, 2008
Under the interface.
ip ospf flood-reduction
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Posted by Peter Kurdziel on October 26, 2008
On low speed links use IP OSPF DEMAND-CIRCUIT to reduce periodic OSPF hello’s and update flooding.
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Posted by Peter Kurdziel on October 26, 2008
A reference bandwidth of 40,000 results ina cost of 4.
40000 reference bandwidth/ 10000 interface bandwidth = 4
Set under the OSPF process.
auto-cost reference-bandwidth 40000
Make sure you set the same auto-cost value throughout the OSPF domain.
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Posted by Peter Kurdziel on October 26, 2008
ip ospf network point-to-multipoint non-broadcast
uses unicast
no DR/BDR election
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