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Chapter 4
IP Networking
Mask (255.255.255.0) is a 24-bit mask, meaning all addresses within the 172.20.214.0 subnet can
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be a destination.
Gateway (172.20.214.92) is the gateway address. All outbound traffic belonging to this network is
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sent to this gateway.
Interface (cpm0) indicates that the ONS 15454 Ethernet interface is used to reach the gateway.
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Entry #3 shows the following:
Destination (172.20.214.92) is the destination host IP address.
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Mask (255.255.255.255) is a 32 bit mask, meaning only the 172.20.214.92 address is a destination.
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Gateway (127.0.0.1) is a loopback address. The host directs network traffic to itself using this
address.
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Interface (lo0) indicates that the local loopback interface is used to reach the gateway.
Entry #4 shows the following:
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Destination (172.20.214.93) is the destination host IP address.
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Mask (255.255.255.255) is a 32 bit mask, meaning only the 172.20.214.93 address is a destination.
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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.
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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.
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Mask (255.255.255.255) is a 32-bit mask, meaning only the 172.20.214.94 address is a destination.
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Gateway (172.20.214.93) indicates that the destination host is accessed through a node with IP
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address 172.20.214.93.
Interface (pdcc0) indicates that a SONET SDCC interface is used to reach the gateway.
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November 2001
Viewing the ONS 15454 Routing Table
Cisco ONS 15454 Installation and Operations Guide
4-17
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