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Cisco ONS 15454 Installation and Operations Guide
November 2001
Chapter 4 IP Networking
Viewing the ONS 15454 Routing Table
• Mask (255.255.255.0) is a 24-bit mask, meaning all addresses within the 172.20.214.0 subnet can
be a destination.
• Gateway (172.20.214.92) is the gateway address. All outbound traffic belonging to this network is
sent to this gateway.
• Interface (cpm0) indicates that the ONS 15454 Ethernet interface is used to reach the gateway.
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 address is a destination.
• 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 address is a destination.
• 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 accessed through a node with IP
address 172.20.214.93.
• Interface (pdcc0) indicates that a SONET SDCC interface is used to reach the gateway.
