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Cisco EtherSwitch Service Modules Feature Guide
Information About the Cisco EtherSwitch Service Modules
7
Cisco IOS Release 12.2(25)SEC
Manageability Features
Note The encrypted Secure Shell (SSH) feature listed in this section is available only on the cryptographic
versions of the Cisco EtherSwitch service module software image.
• Cisco IE 2100 Series CNS embedded agents for automating Cisco EtherSwitch service module
management as well as configuration storage and delivery.
• Dynamic Host Configuration Protocol (DHCP) for automating configuration of Cisco EtherSwitch
service module information (such as IP address, default gateway, hostname, and Domain Name
System [DNS] and Trivial File Transfer Protocol [TFTP] server names)
• DHCP relay agent information (option 82) for subscriber identification and IP address management
• DHCP relay for forwarding User Datagram Protocol (UDP) broadcasts, including IP address
requests, from DHCP clients
• DHCP server for automatic assignment of IP addresses and other DHCP options to IP hosts
• Directed unicast requests to a DNS server for identifying a Cisco EtherSwitch service module
through its IP address and its corresponding hostname and to a TFTP server for administering
software upgrades from a TFTP server
• Address Resolution Protocol (ARP) for identifying a Cisco EtherSwitch service module through its
IP address and its corresponding Media Access Control (MAC) address
• Unicast MAC address filtering to drop packets with specific source or destination MAC addresses
• Cisco Discovery Protocol (CDP) versions 1 and 2 for network topology discovery and mapping
between the Cisco EtherSwitch service module and other Cisco devices on the network
• Network Time Protocol (NTP) for providing a consistent time stamp to all Cisco EtherSwitch
service modules from an external source
• Cisco IOS File System (IFS) for providing a single interface to all file systems that the
Cisco EtherSwitch service module uses
• In-band management access for up to 16 simultaneous Telnet connections for multiple CLI-based
sessions over the network
• In-band management access for up to five simultaneous, encrypted SSH connections for multiple
CLI-based sessions over the network (requires the cryptographic versions of the Cisco EtherSwitch
service module software image)
• In-band management access through SNMP versions 1 and 2c, and 3 GET and SET requests
Availability Features
• HSRP for command Cisco EtherSwitch service module and Layer 3 router redundancy.
• Automatic stack master re-election for replacing stack masters that become unavailable (failover
support).
The newly elected stack master begins accepting Layer 2 traffic in less than 1 second and Layer 3
traffic between 3 to 5 seconds.
• Cross-stack EtherChannel for providing redundant links across the switch stack.
• UniDirectional Link Detection (UDLD) and aggressive UDLD for detecting and disabling
unidirectional links on fiber-optic interfaces caused by incorrect fiber-optic wiring or port faults.