COMMAND LINE INTERFACE

determined by the mask, and not the order in which the ACL rules were entered.

•First create the required ACLs and ingress or egress masks before mapping an ACL to an interface.

•If you enter dscp, you cannot enter tos or precedence. You can enter both tos and precedence without dscp.

•Masks that include an entry for a Layer 4 protocol source port or destination port can only be applied to packets with a header length of exactly five bytes.

Example

This example creates an IP ingress mask with two rules. Each rule is checked in order of precedence to look for a match in the ACL entries. The first entry matching a mask is applied to the inbound packet.

Console(config)#access-list ip mask-precedence in

Console(config-ip-mask-acl)#mask host any

Console(config-ip-mask-acl)#mask 255.255.255.0 any

Console(config-ip-mask-acl)#

This shows that the entries in the mask override the precedence in which the rules are entered into the ACL. In the following example, packets with the source address 10.1.1.1 are dropped because the “deny 10.1.1.1 255.255.255.255” rule has the higher precedence according the “mask host any” entry.

Console(config)#access-list ip standard A2

Console(config-std-acl)#permit 10.1.1.0 255.255.255.0

Console(config-std-acl)#deny 10.1.1.1 255.255.255.255

Console(config-std-acl)#exit

Console(config)#access-list ip mask-precedence in

Console(config-ip-mask-acl)#mask host any

Console(config-ip-mask-acl)#mask 255.255.255.0 any

Console(config-ip-mask-acl)#

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SMC6824M specifications

The SMC Networks SMC6824M is a robust and reliable managed switch that caters to the needs of small to mid-sized businesses, as well as enterprise environments. This switch is designed to provide enhanced performance, scalability, and security for network infrastructures that require efficient traffic management and comprehensive control.

One of the key features of the SMC6824M is its 24 10/100/1000BASE-T ports, which offer lightning-fast Ethernet connectivity. These ports are capable of auto-negotiation, allowing devices to automatically adjust their settings for optimal performance, making it easier to integrate various hardware into existing networks. Additionally, the switch includes four Gigabit SFP slots for fiber uplinks, which allow for extended connectivity options and improved network design.

The SMC6824M employs advanced Layer 2 and Layer 3 functionalities, giving network administrators the tools they need to manage their networks effectively. It supports features like VLAN (Virtual Local Area Network) support and Quality of Service (QoS), ensuring efficient bandwidth management and enhanced performance for critical applications. Through VLAN segmentation, it can isolate network traffic for different departments or functions, enhancing security and reducing congestion.

The switch also offers comprehensive network management capabilities through SNMP (Simple Network Management Protocol) and a web-based interface, enabling easy configuration, monitoring, and troubleshooting. The SMC6824M includes support for port mirroring, which is important for diagnostics and monitoring network performance.

Another significant characteristic of the SMC6824M is its redundancy features, which include IEEE 802.1d Spanning Tree Protocol (STP) to prevent loops and provide network resilience. This is essential for maintaining continuous operation, especially in dynamic environments where network availability is critical.

In terms of security, the SMC6824M supports 802.1X port-based authentication, ensuring that only authorized devices gain access to the network. This feature is crucial for protecting sensitive data and maintaining the integrity of the network.

Overall, the SMC Networks SMC6824M is a versatile and feature-rich managed switch that delivers the performance and flexibility required to support growing networks. Its combination of layer management, security features, and user-friendly interface makes it an excellent choice for organizations looking to enhance their network infrastructure.
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