Figure 19: Structure of Cisco HDLC Protocol
The E-series router supports IP over Cisco HDLC on many types of serial interfaces. Cisco HDLC monitors line status on a serial interface by exchanging keepalive request messages with peer network devices. It also allows routers to discover IP addresses of neighbors by exchanging Serial Link Address Resolution Protocol (SLARP) address request and address response messages with peer network devices.
The E-series router Cisco HDLC is compatible with the Cisco Systems Cisco-HDLC protocol, the default protocol for all Cisco serial interfaces.
The router supports the following framing features:
Figure 19: Structure of Cisco HDLC Protocol
As shown in Figure 19, the Cisco HDLC protocol can exist directly on top of the HDLC layer or ATM or SONET interface. Both SONET and DSx/Ex interfaces are supported at the physical layer.
The following example configures HDLC on a serial interface. See JUNOSe Link Layer Configuration Guide , for details.
- host1(config)#interface serial 3/1:2/1
- host1(config-if)#encapsulation hdlc
- host1(config-if)#ip address 192.32.10.2 255.255.255.0
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