Advantech EKI-9512-C0IDW10E, Руководство пользователя

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245 EKI-9500 Series User Manual
4.5 Routing
When a packet enters the switch, the destination MAC address is checked to see if it
matches any of the configured routing interfaces. If it does, then the silicon searches
the host table for a matching destination IP address. If an entry is found, then the
packet is routed to the host. If there is not a matching entry, then the switch performs
a longest prefix match on the destination IP address. If an entry is found, then the
packet is routed to the next hop. If there is no match, then the packet is routed to the
next hop specified in the default route. If there is no default route configured, then the
packet is passed to the 6200 series software to be handled appropriately.
The routing table can have entries added either statically by the administrator or
dynamically via a routing protocol. The host table can have entries added either stat-
ically by the administrator or dynamically via ARP.
4.5.1 ARP Table
The ARP protocol associates a layer 2 MAC address with a layer 3 IPv4 address.
FASTPATH SMB software features both dynamic and manual ARP configuration.
With manual ARP configuration, you can statically add entries into the ARP table.
ARP is a necessary part of the internet protocol (IP) and is used to translate an IP
address to a media (MAC) address, defined by a local area network (LAN) such as
Ethernet. A station needing to send an IP packet must learn the MAC address of the
IP destination, or of the next hop router, if the destination is not on the same subnet.
This is achieved by broadcasting an ARP request packet, to which the intended
recipient responds by unicasting an ARP reply containing its MAC address. Once
learned, the MAC address is used in the destination address field of the layer 2
header prepended to the IP packet.
The ARP cache is a table maintained locally in each station on a network. ARP cache
entries are learned by examining the source information in the ARP packet payload
fields, regardless of whether it is an ARP request or response. Thus, when an ARP
request is broadcast to all stations on a LAN segment or virtual LAN (VLAN), every
recipient has the opportunity to store the sender's IP and MAC address in their
respective ARP cache. The ARP response, being unicast, is normally seen only by
Interface 1 Specifies the first member interface for the X-Ring Pro group. The
value is either physical port or LAG (Link-Aggregation-Group) port.
Interface 2 Specifies the secondary member interface for the X-Ring Pro group.

For the X-Ring Pro group denoted as “Ring”, the value is either
physical port or LAG (Link-Aggregation-Group) port.

For the X-Ring Pro group denoted as “Coupling”, the value is
physical port or LAG (Link-Aggregation-Group) port or “None”.
The value “None” implies the X-Ring Pro group is created not for
coupling dual-homing application.
Forward State Specifies the spanning tree state of the member interface of an X-Ring
Pro group. The value is “Discarding” or “Forwarding”.

Discarding: Discard traffic in both ingress and egress directions.

Forwarding: Forward ingress traffic bases on the result of for-
warding database lookup.
Master Ring Specifies the X-Ring Pro network that is coupling connected by the X-
Ring Pro group denoted as “Coupling”. This field is required for the X-
Ring coupling application only.
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