Node Alias Overview
NoteBy default, Node Alias is disabled on all ports.
Currently, 100 packets per second per slot are admitted for snooping. Packets are dropped if the rate exceeds 100 pps.
Node Alias Database Information
- Incoming port
- VLAN ID
- Source MAC address
- Protocol address—Depending on the protocol type, this could be the IPv4/IPv6 source IP address, or the UDP source port in cases where the destination IP is broadcast, etc., the virtual router ID and Priority for VRRP.
- Node Alias ID—A unique number that identifies an entry
- Entry creation time
The database is capable of holding 8,192 entries per-slot. To avoid starvation among ports, each port is allowed to create only its share of entries in the database. The default maximum per port is 8,192 divided by the number of ports on the slot. For example, on a 64-port slot, this translates to 128 entries per port. You can modify the per-port maximum (configure nodealias ports [port_list |all] maxentries entries) up to the limit of 8,192.
As a result of snooping one frame, Node Alias may create additional entries to facilitate the searching based on finer details, such as protocol type. For example, when a BGP frame is received, two entries are created: one entry with protocol type IP, and another entry with protocol type BGP.
Node Alias also supports VMAN. For VMANs, itt includes the VMAN ID, instead of VLAN ID in the database.
If the ports are combined to form a LAG, Node Alias must be enabled on individual ports; enabling Node Alias on the master port does not automatically enable Node Alias on member ports.
- ARP is categorized under IP.
- UDP entry is created when destination IP address is broadcast.
- BPDU means STP and GVRP frames.