asked on understanding Prefix-List
I am trying to understand the purpose of the number that comes after the "/".
example:
ip prefix-list TEST seq 5 permit 10.0.0.0/2 ge 17
2 means match 2 bits of first octet 10
however whatever I put , the prefix list will care just about the ge 17
to clarify it I have this table before filtering:
if I use : ip prefix-list TEST seq 5 permit 10.0.0.0/2 ge 17
router eigrp 1
distribute-list prefix TEST in
so what 's the purpose of the number that comes after the slash sign "/", example:10.0.0.0/2
Thank you
example:
ip prefix-list TEST seq 5 permit 10.0.0.0/2 ge 17
2 means match 2 bits of first octet 10
however whatever I put , the prefix list will care just about the ge 17
to clarify it I have this table before filtering:
R1(config)#do sh ip route
10.0.0.0/8 is variably subnetted, 6 subnets, 6 masks
D 10.1.0.0/16 [90/156160] via 192.168.12.2, 00:00:01, FastEthernet0/0
D 10.2.0.0/17 [90/156160] via 192.168.12.2, 00:00:01, FastEthernet0/0
D 10.3.0.0/18 [90/156160] via 192.168.12.2, 00:00:01, FastEthernet0/0
D 10.4.0.0/19 [90/156160] via 192.168.12.2, 00:00:01, FastEthernet0/0
D 10.5.0.0/20 [90/156160] via 192.168.12.2, 00:00:01, FastEthernet0/0
D 10.6.0.0/21 [90/156160] via 192.168.12.2, 00:00:01, FastEthernet0/0
if I use : ip prefix-list TEST seq 5 permit 10.0.0.0/2 ge 17
router eigrp 1
distribute-list prefix TEST in
R1(config)#do sh ip route
10.0.0.0/8 is variably subnetted, 5 subnets, 5 masks
D 10.2.0.0/17 [90/156160] via 192.168.12.2, 00:00:03, FastEthernet0/0
D 10.3.0.0/18 [90/156160] via 192.168.12.2, 00:00:03, FastEthernet0/0
D 10.4.0.0/19 [90/156160] via 192.168.12.2, 00:00:03, FastEthernet0/0
D 10.5.0.0/20 [90/156160] via 192.168.12.2, 00:00:03, FastEthernet0/0
D 10.6.0.0/21 [90/156160] via 192.168.12.2, 00:00:03, FastEthernet0/0
so what 's the purpose of the number that comes after the slash sign "/", example:10.0.0.0/2
Thank you
RoutersNetworkingNetwork OperationsNetwork Architecture
Last Comment
jskfan
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ASKER
i know 10 in binary is 00001010
if My prefix list is :
ip prefix-list LIST1 permit 10.0.0.0/2
you would think from the first octet (10) in binary it has 2 Zeros 00001010
so any network that starts with 10 in our case is permitted
but when I used that prefix list ... the routing table dis not show any of the Network 10
if My prefix list is :
ip prefix-list LIST1 permit 10.0.0.0/2
you would think from the first octet (10) in binary it has 2 Zeros 00001010
so any network that starts with 10 in our case is permitted
but when I used that prefix list ... the routing table dis not show any of the Network 10
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ASKER
Thank you Guys !
I had this one : 10.0.0.0/2 ge 17 -----you can see it is just 2 bits after the slash "/"
if it was 10.0.0.0/8 ge 17 or 10.0.0.0/16 ge 17, it would make sense , but 2 bits from the first octet , I could not tell what is covered to be permitted and what is not...