I have come accross a config on one of our routera. Can somone help me understand what the below does
distribute-list prefix ospf-filter in ip prefix-list ospf-filter seq 1 permit 0.0.0.0/0
Is the above saying do not learn any routes coming in? what is permit 0.0.0.0/0 doing?
interface FastEthernet0/0 ip address 192.168.37.38 255.255.255.0 speed 100 full-duplex ! interface FastEthernet0/1 ip address 192.168.47.65 255.255.255.192 duplex auto speed auto ! interface ATM0/1/0 no ip address shutdown no atm ilmi-keepalive dsl operating-mode auto ! router ospf 3778 log-adjacency-changes network 192.168.37.0 0.0.0.255 area 0 network 192.168.47.64 0.0.0.63 area 18.104.22.168 distribute-list prefix ospf-filter in !
My understanding is that the area range command suppresses the automatic origination of Type-3 LSAs on ABRs for the component routes matching the configured network. By default (advertise keyword), the ABR will advertise a Type-3 summary instead of those components, and with the not-advertise keyword it does not. So actually it filters Type-3 LSAs.
The area filter-list command is a more sophisticated way for Type-3 LSA filtering, introduced in IOS 12.0(15)S. I guess that before, the area range not-advertise command was the only way to achieve Type-3 LSA filtering (introduced already in IOS 10.0).
This is actually a pretty cool feature, i didn't even know it existed until I was looking for a solution to advertise a subnet (prefix in BGP talk), only if a certain condition existed. This is exactly what conditional advertisements does
j ai une question j ai achete un routeur cisco 887VA-k9 , je le configuré avec la configuration ci- dessous
si je le lier avec mon pc portable sur l un de ses ports directement ça marche toute est bien ( la connexion internet + m...
Attached policy provides CLI access to the Cisco 4G router over text messaging. Two files are in the attached .tar file:
2. PDF with instructions on how to load and use the .tcl file.