Similarly, LCP also works if the period of keepalives at each end is different. When Frame Relay encapsulation is enabled on a serial interface, the interface configuration is hierarchical and comprises the following elements:. Note The administrative state of a parent interface drives the state of the subinterface and its PVC. When the administrative state of a parent interface or subinterface changes, so does the administrative state of any child PVC configured under that parent interface or subinterface.
Frame Relay interfaces support two types of encapsulated frames:. If the encapsulation type is not configured explicitly for a PVC, then that PVC inherits the encapsulation type from the main serial interface. Before you configure Frame Relay encapsulation on an interface, you must verify that all prior Layer 3 configuration is removed from that interface. For example, you must ensure that there is no IP address configured directly under the main interface; otherwise, any Frame Relay configuration done under the main interface will not be viable.
Use the following formula to calculate the maximum number of PVCs supported on a card:. Note The default setting of the mtu command for a serial interface is bytes. To configure a synchronous serial interface, perform the tasks in the following sections.
Each task in the list is identified as either required or optional. To specify a synchronous serial interface and enter interface configuration mode, use the following commands in global configuration mode. Specifies the serial interface and enters interface configuration mode.
The serial interfaces support the following serial encapsulation methods:. To define the encapsulation method, use the following command in interface configuration mode. Encapsulation methods are set according to the type of protocol or application you configure in the Cisco IOS software.
You can use the physical-layer async command to change the interface mode from the default synchronous mode to asynchronous mode. Specifies the mode of a low-speed interface as either synchronous or asynchronous.
Note You cannot use the physical-layer async command for frame-relay encapsulation. When you make a transition from asynchronous mode to synchronous mode in serial interfaces, the interface state becomes down by default.
You should then use the no shutdown option to bring the interface up. This example shows how to configure frame relay encapsulation on a serial interface.
This example shows how to configure Multilink PPP on a serial interface. Some engineers use point-to-point ospf command to manipulate OSPF advertisement, by changing the link type, especially in the case of loopback addresses. Buy or Renew. Find A Community. Cisco Community. Thank you for your support! We're happy to announce that we met our goal for the Community Helping Community campaign!
Turn on suggestions. Auto-suggest helps you quickly narrow down your search results by suggesting possible matches as you type. Showing results for. Search instead for. Did you mean:. All Community This category This board. I came across this phrase Adjacencies on Point-to-Point Interfaces OSPF will always form an adjacency with the neighbor on the other side of a point-to-point interface such as point-to-point serial lines. The state of the serial interfaces is point to point.
Is point to point referring to the network as in 2 nodes in the network can only get to each other only or - is there any point to point network that involved more then 2 nodes?
Regards, Confused Noob Solved! Labels: Labels: Other Switching. All forum topics Previous Topic Next Topic. Accepted Solutions. InayathUlla Sharieff. Cisco Employee. Mark Malone. VIP Mentor. In response to SJ K. In response to InayathUlla Sharieff.
Hi Inayath, Thanks for your response! Or GE connecting directly between SWSw2 and nothing in between this devices Answer : Point to Point connection means anything directly connecting between them. Regards, Noob. Q Answer already provided or read above. HTH Regards Inayath. Certain show commands are supported by the Output Interpreter Tool registered customers only , which allows you to view an analysis of show command output.
This output shows that Router1 has one neighbor with a Router ID of 2. The address 1. For additional information about the show ip ospf neighbor command, refer to What Does the show ip ospf neighbor Command Reveal? This is the output of the show ip ospf interface serial 0 command on Router1. Similarly, this example displays the output for the show ip ospf neighbor and the show ip ospf interface commands on Router2.
The show ip ospf neighbor command on Router1 and Router2 confirms full adjacency. You can also see that the internet address is 0. This is because an IP address is borrowed from the loopback interface in this case by virtue of the ip unnumbered command.
This example displays the output of the show ip ospf neighbor and show ip ospf interface serial 0 commands on Router2. This example shows the output of the show ip route command on Router1 with encapsulation PPP and the use of unnumbered interfaces.
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