Intel SBCEGBESW1 User Guide - Page 23

SNTP Feature Spanning Tree SSH Static MAC Entries Storm Control TACACS+ TCP TFTP Trivial File Transfer Protocol UDP Relay Description The Simple Network Time Protocol (SNTP) assures accurate network device clock time synchronization up to the millisecond. Time synchronization is performed by a network SNTP server. Time sources are established by Stratums. Stratums define the distance from the reference clock. The higher the stratum (where zero is the highest), the more accurate the clock. The Spanning Tree Protocol (STP) is a standard Layer 2 switch requirement that allows bridges to automatically prevent and resolve L2 forwarding loops. Switches exchange configuration messages using specifically formatted frames and selectively enable and disable forwarding on ports. Spanning Tree can be enabled in the following modes: • Classic Spanning Tree • Rapid Spanning Tree • Multiple Spanning Tree Secure Shell (SSH) is a protocol that provides a secure, remote connection to a device. There are currently two versions of SSH available: version 1 and 2. The SSH server feature enables an SSH client to establish a secure, encrypted connection with a device. This connection provides functionality that is similar to an inbound telnet connection. SSH uses RSA Public Key cryptography for device connections and authentication User defined static MAC entries are stored in the Bridging Table, in addition to the Self Learned MAC addresses. Storm Control enables limiting the amount of Multicast and Broadcast frames accepted and forwarded by the device. When Layer 2 frames are forwarded, Broadcast and Multicast frames are flooded to all ports on the relevant VLAN. This occupies bandwidth, and loads all nodes connected on all ports. In addition to RADIUS support, the device also supports the Terminal Access Controller Access Control System (TACACS+). TACACS+ is a security application implemented in a Client/Server based protocol that provides centralized validation of users attempting to gain access to a router or network access server. Transport Control Protocol (TCP) hides applications errors. TCP connections are defined between 2 ports by an initial synchronization exchange. TCP ports are identified by an IP address and a 16-bit port number. Octets streams are divided into TCP packets, each carrying a sequence number. The device supports boot image, software and configuration upload/download via TFTP UDP Relay enables the device to forward specific UDP broadcasts from one interface to another. IP broadcast packets from one interface are not generally forwarded to another interface. However, some applications use UDP broadcast to detect the availability of a service. Other services require Broadcast packets to be routed to provide services to clients on another subnet. Intel® Blade Server Ethernet Switch Modules SBCEGBESW1 and SBCEGBESW10 EWS User Guide 7