traversing through the ingress and egress interfaces are examined and, appropriate ACLs can be applied in boththe ingress and egress direction. Flow-based monitoring conserves bandwidth by monitoring only specified trafficinstead all traffic on the interface. This feature is particularly useful when looking for malicious traffic. It is availablefor Layer 2 and Layer 3 ingress and egress traffic. You may specify traffic using standard or extended access-lists.This mechanism copies all incoming or outgoing packets on one port and forwards (mirrors) them to another port.The source port is the monitored port (MD) and the destination port is the monitoring port (MG).seq (for IPv6 ACLs)Assign a sequence number to a deny or permit the filter in an IPv6 access list while creating the filter.Syntax seq sequence-number {deny | permit} {ipv6-protocol-number | icmp | ip | tcp |udp} {source address mask | any | host ipv6-address} {destination address | any| host ipv6-address} [operator port [portnumber | portname]] [count [byte]][log [interval minutes] [threshold-in-msgs [count]] [monitor]To delete a filter, use the no seq sequence-number command.Parameters sequence-number Enter a number from 0 to 4294967290.deny Enter the keyword deny to configure a filter to drop packets meeting this condition.permit Enter the keyword permit to configure a filter to forward packets meeting this criteria.ipv6-protocol-numberEnter a number to filter based on the protocol identified in the IPv6 protocol header.icmp Enter the keyword icmp to configure an ICMP access list filter.ip Enter the keyword ip to configure a generic IP access list. The keyword ip specifies thatthe access list permits all IP protocols.tcp Enter the keyword tcp to configure a TCP access list filter.udp Enter the keyword udp to configure a UDP access list filter.source Enter an IP address in dotted decimal format of the network from which the packet wasreceived.mask (OPTIONAL) Enter a network mask in /prefix format (/x) .any Enter the keyword any to specify that all routes are subject to the filter.host ipv6-address Enter the keyword host and then enter the IPv6 address to specify a host IP address orhostname.operator (OPTIONAL) Enter one of the following logical operands:• eq = equal to• neq = not equal to• gt = greater than• lt = less than• range = inclusive range of ports (you must specify two ports for the portparameter.)portnumber (OPTIONAL) Enter the application layer port number. Enter two port numbers if you areusing the range logical operand. The range is from 0 to 65535.Access Control Lists (ACL) 319
