Allen-Bradley armorstratix 5700, Руководство пользователя, Страница: 136 / 458

136 Rockwell Automation Publication 1783-UM007I-EN-P - December 2017
Chapter 3 Configure Switch Features
Enhanced Interior Gateway
Routing Protocol (EIGRP) EIGRP is available on the following switches:
•
Stratix 5400 with Layer 3 firmware
•
Stratix 5410 with Layer 3 firmware
•
Stratix 8300 base units
EIGRP is a Cisco proprietary, distance-vector-routing protocol. Key
capabilities that distinguish EIGRP from other routing protocols include fast
convergence, support for variable-length subnet mask, support for partial
updates, and support for multiple network layer protocols.
A router that runs EIGRP stores all neighbor routing tables so that it can
quickly adapt to alternate routes. If no appropriate route exists, EIGRP queries
its neighbors to discover an alternate route. These queries propagate until an
alternate route is found. Its support for variable-length subnet masks permits
routes to be automatically summarized on a network number boundary. In
addition, EIGRP can be configured to summarize on any bit boundary at any
interface. EIGRP does not make periodic updates. Instead, it sends partial
updates only when the metric for a route changes. Propagation of partial
updates is automatically bounded so that only those routers that need the
information are updated.
Neighbor discovery is the process that the EIGRP router uses to learn
dynamically of other routers on directly attached networks. EIGRP routers
send out multicast hello packets to announce their presence on the network.
You can also define static neighbors, which receive unicast packets. When the
router receives a hello packet from a new neighbor, it sends its topology table
to the neighbor with an initialization bit set. When the neighbor receives the
topology update with the initialization bit set, the neighbor sends its topology
table back to the EIGRP router. Once this neighbor relationship is established,
routing updates are not exchanged unless there is a change in the network
topology.
Table 49 - DHCP Address Assignment Fields
Field Description
Unit
(Stratix 8000/8300 switches) Displays the unit on which the selected port resides:
• 6 Port Base
• 10 Port Base
• Expansion 1
• Expansion 2
Port Displays the ports available for the configuration. The port number includes the port type (Fa for Fast Ethernet and Gi for Gigabit Ethernet), the
base or expansion module number (1, 2, or 3), and the port number:
• Gi1/1 is Gigabit Ethernet port 1 on the base.
• Fa1/1 is Fast Ethernet port 1 on the base.
• Fa2/1 is Fast Ethernet port 1 on the first expansion module.
• Fa3/1 is Fast Ethernet port 1 on the second expansion module.
Pool Displays the pool names from the DHCP IP address pool that corresponds to the instances available in the switch.
If you delete all rows that contain pools on the DHCP Pool Display tab and click Refresh, the Pool field is blank.
IP Address Displays the IP address that is assigned to the switch port. The format is a 32-bit numeric address that is written as four numbers that are
separated by periods (for example, 255.255.255.255). Each number can be from 0…255.
The IP address that you assign is reserved for the selected port and is not available for normal DHCP dynamic assignment. The IP address must
be an address from the pool that is specified in the DHCP Pool Name field.