Which Casework Abide on the Ascendancy Plane?
To accept the accessible threats and attacks adjoin a switch’s ascendancy plane, it is
necessary to accept what casework abide on the ascendancy plane:
• L2 processing. A about-face charge action and acknowledge to Spanning Tree Protocol (STP),
Per-VLAN Spanning Tree (PVST), Link Aggregation Ascendancy Protocol (LACP), Port
Aggregation Protocol (PAgP), 802.1X, Cisco Discovery Protocol (CDP), Dynamic
Trunk Protocol (DTP), UniDirectional Link Detection (UDLD), VLAN Trunk
Protocol (VTP), and keepalive packets.
• Internet Group Administration Protocol (IGMP). A about-face charge action IGMP
packets to acquiesce audience to accompany multicast streams, such as watching videos.
• Internet Ascendancy Message Protocol (ICMP). ICMP packets charge be processed, not
only for responding to pings, but to accept ascendancy packets, such as ICMP
Destination Unreachable, ICMP Redirect, ICMP Time Exceeded Expired, and so on.
• L3 processing. If a about-face is a allotment of a Layer 3 area and performs acquisition between
VLANs, it usually has to action acquisition updates from its neighbors. Also, packets
with IP options and packets, which expire on the about-face (TTL=1), charge special
handling.
• Administration traffic. Usually, no concrete abreast exists amid the management
plane and the ascendancy plane, which after-effects in administration even packets being
funnelled through the ascendancy plane. This includes Telnet, Secure Shell (SSH), Simple
Network Administration Protocol (SNMP), and Secure Socket Layer (SSL) packets
destined to the about-face itself.
On high-end platforms, some of these casework are implemented on the band cards
themselves (primarily Layer 2), but the axial CPU handles best services.