4-17
Cisco ONS 15454 Installation and Operations Guide
November 2001
Chapter4 IP Networking
Viewing the ONS 15454 Routing Table
•Mask (255.255.255.0) is a 24-bit mask, meaning all addresse s wi thi n th e 172 .20.2 14. 0 subnet ca n
be a destination.
•Gateway (172.20.214.92) is the gateway address. All outbound traffic b elonging to this network is
sent to this gateway.
•Interface (cpm0) indicates that the ONS 15454 Ethern et int erfa c e i s u sed t o re ac h the gat ewa y.
Entry #3 shows the following:
•Destination (172.20.214.92) is the destination host IP address.
•Mask (255.255.255.255) is a 32 bit mask, meaning only the 172.20.214.92 a ddr ess is a de stin ation .
•Gateway (127.0.0.1) is a loopback address. The host directs network traffic to itself using this
address.
•Interface (lo0) indicates that the local loopback interface is used to reach the gateway.
Entry #4 shows the following:
•Destination (172.20.214.93) is the destination host IP address.
•Mask (255.255.255.255) is a 32 bit mask, meaning only the 172.20.214.93 a ddr ess is a de stin ation .
•Gateway (0.0.0.0) means the destination host is directly attached to the node.
•Interface (pdcc0) indicates that a SONET SDCC interface is used to reach the destination host.
Entry #5 shows a DCC-connected node that is accessible through a node that is not directly connected:
•Destination (172.20.214.94) is the destination host IP address.
•Mask (255.255.255.255) is a 32-bit mask, meaning only the 172.20.214.94 address is a destination.
•Gateway (172.20.214.93) indicates that the destination host is accesse d t hro ugh a no de wit h I P
address 172.20.214.93.
•Interface (pdcc0) indicates that a SONET SDCC interface is used to reach the gateway.