Hi Ann, The le parameter can be included to match all more-specific prefixes within a par ten prefix up to a specified length. FE: 202.168.136.0/22 le 25 will match 202.168.136.0/22 and all prefixes contained therein with a length of 24 or less. They appear to be blocking everything with a length longer dan /24 (so /25 /26 etc etc.) the last line doesn't have this because it's only 1 /24 subnet. Regards, Wouter On Feb 1, 2012, at 15:32 , Ann Kwok wrote:
Hi
I read this prefix list.
Can I know why there is "le 24" after network block in /22 and /21
Why don't have "le 24" after /24?
I also saw another prefix list before. They use "le 32" instead of "le 24"
What are their different?
ip prefix-list prefix-filter-as100 seq 10 permit 202,168.136.0/22 le 24 ip prefix-list prefix-filter-as100 seq 20 permit 202,22.92.0/22 le 24 ip prefix-list prefix-filter-as100 seq 30 permit 202,21.148.0/22 le 24 ip prefix-list prefix-filter-as100 seq 40 permit 203,178.88.0/21 le 24 ip prefix-list prefix-filter-as100 seq 50 permit 178.88.74.0/24
Thank you so much