Cisco 15327 - Manual (Page 406)

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Ethernet Card Software Feature and Configuration Guide, R7.2
Chapter 23 E-Series and G-Series Ethernet Operation
E-Series Hub-and-Spoke Ethernet Circuit Provisioning
E-Series Hub-and-Spoke Ethernet Circuit Provisioning
The hub-and-spoke configuration connects point-to-point circuits (the spokes) to an aggregation point
(the hub). In many cases, the hub links to a high-speed connection and the spokes are Ethernet cards.
Figure 23-22 illustrates a hub-and-spoke ring. Your network architecture might differ from the example.
Figure 23-22 Hub-and-Spoke Ethernet Circuit
E-Series Ethernet Manual Cross-Connects
ONS nodes require end-to-end CTC visibility between nodes for normal provisioning of Ethernet
circuits. When other vendors’ equipment sits between ONS nodes, OSI/TARP-based equipment does not
allow tunneling of the ONS node TCP/IP-based DCC. To circumvent this inconsistent DCC, the Ethernet
circuit must be manually cross connected to an STS channel using the non-ONS network. The manual
cross-connect allows an Ethernet circuit to run from ONS node to ONS node utilizing the non-ONS
network.
Note In this section, “cross-connect” and “circuit” have the following meanings: cross-connect refers to the
connections that occur within a single ONS node to allow a circuit to enter and exit an ONS 15454.
Circuit refers to the series of connections from a traffic source (where traffic enters the ONS 15454
network) to the drop or destination (where traffic exits an ONS 15454 network).
Remote Monitoring Specification Alarm Thresholds
The ONS nodes features remote monitoring (RMON) that allows network operators to monitor the health
of the network with a network management system (NMS).
One of the ONS node’s RMON MIBs is the Alarm group, which consists of the alarmTable. An NMS
uses the alarmTable to find the alarm-causing thresholds for network performance. The thresholds apply
to the current 15-minute interval and the current 24-hour interval. RMON monitors several variables,
such as Ethernet collisions, and triggers an event when the variable crosses a threshold during that time
43386
ONS Node 1
ONS Node 2 192.168.1.25
255.255.255.0
VLAN test
192.168.1.50
255.255.255.0
VLAN test
192.168.1.125
255.255.255.0
VLAN test
192.168.1.75
255.255.255.0
VLAN test
192.168.1.100
255.255.255.0
VLAN test
ONS Node 3