OS10 Enterprise Edition User Guide Release 10.4.0E(R3)

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Assign sequence number to filter

IP ACLs filter on source and destination IP addresses, IP host addresses, TCP addresses, TCP host addresses, UDP addresses, and UDP host addresses. Traffic passes through the filter by filter sequence. Configure the IP ACL by first entering IP ACCESS-LIST mode and then assigning a sequence number to the filter.

User-provided sequence number

  • Enter IP ACCESS LIST mode by creating an IP ACL in CONFIGURATION mode.
    ip access-list 
                                           access-list-name
                                        
  • Configure a drop or forward filter in IPV4-ACL mode.
    seq 
                                           sequence-number {deny | permit | remark} {
                                           ip-protocol-number | icmp | ip | protocol | tcp | udp} {
                                           source prefix | 
                                           source mask | any | host} {
                                           destination mask | any | host 
                                           ip-address} [count [byte]] [fragments]
                                        

Auto-generated sequence number

If you are creating an ACL with only one or two filters, you can let the system assign a sequence number based on the order in which you configure the filters. The system assigns sequence numbers to filters using multiples of ten values.

  • Configure a deny or permit filter to examine IP packets in IPV4-ACL mode.
    {deny | permit} {
                                           source mask | any | host 
                                           ip-address} [count [byte]] [fragments]
                                        
  • Configure a deny or permit filter to examine TCP packets in IPV4-ACL mode.
    {deny | permit} tcp {
                                           source mask] | any | host 
                                           ip-address}} [count [byte]] [fragments]
                                        
  • Configure a deny or permit filter to examine UDP packets in IPV4-ACL mode.
    {deny | permit} udp {
                                           source mask | any | host 
                                           ip-address}} [count [byte]] [fragments]
                                        

Assign sequence number to filter

OS10(config)# ip access-list acl1
                                 OS10(conf-ipv4-acl)# seq 5 deny tcp any any capture session 1 count 
                              

View ACLs and packets processed through ACL

OS10# show ip access-lists in
                                 Ingress IP access-list acl1
                                 Active on interfaces :
                                 ethernet1/1/5
                                 seq 5 permit ip any any count (10000 packets)
                              

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