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Casual Articles - Cisco CCNA / CCNP Certification Exam: Frame Relay Encapsulation Types
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Serial0 (up): ip 172.12.123.2 dlci 122(0x7B,0x1CB0), static
broadcast, ietf, status defined, active
Just remember that Cisco is the default, and all PVCs will use Cisco unless you specify IETF in the frame map statement itself. You could also change the entire interface to use IETF for all mappings with the frame-relay encapsulation IETF command. For Cisco exams, as well as work on production networks, it's always a good idea to know more than
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The DCE and DTE must agree on the LMI type, but there's another value that must be agreed upon by the two DTEs serving as the endpoints of the VC. The Frame encapsulation can be left at the default of Cisco (which is Cisco-proprietary), or it can be changed to the industry-standard IETF, as shown below. If a non-Cisco router is the remote endpoint, IETF encapsulation must be used. Note that the default of Cisco isn't listed as an option by IOS Help, so you better know that one by heart!
R1(config)#int s0
R1(config-if)#encap frame ?
ietf Use RFC1490/RFC2427 encapsulation
R1(config-if)#encap frame ietf
What if a physical interface is in use and some remote hosts require Cisco encapsulation and others require IETF? The encapsulation type can be configured on a per-PVC basis as well. One encap type can be used on the interface, and any map statements that require a different encap type can have that specified in the appropriate map statement. In the following example, all PVCs will use the default Cisco encapsulation type except for PVC 115. The frame map statement using that PVC has ietf specified.
R1(config)#int s0/0
R1(config-if)#encap frame
R1(config-if)#frame map ip 172.12.123.3 123 broadcast
R1(config-if)#frame map ip 172.12.123.2 122 ietf broadcast
show frame map shows us that the mapping to DLCI 123 is using Cisco encapsulation, and DLCI 122 is using IETF.
R1#show frame map
Serial0 (up): ip 172.12.123.3 dlci 123(0x7B,0x1CB0), static
broadcast, CISCO, status defined, active
Serial0 (up): ip 172.12.123.2 dlci 122(0x7B,0x1CB0), static
broadcast, ietf, status defined, active
Just remember that Cisco is the default, and all PVCs will use Cisco unless you specify IETF in the frame map statement itself. You could also change the entire interface to use IETF for all mappings with the frame-relay encapsulation IETF command. For Cisco exams, as well as work on production networks, it's always a good idea to know more than
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R1(config)#int s0
R1(config-if)#encap frame ?
ietf Use RFC1490/RFC2427 encapsulation
R1(config-if)#encap frame ietf
What if a physical interface is in use and some remote hosts require Cisco encapsulation and others require IETF? The encapsulation type can be configured on a per-PVC basis as well. One encap type can be used on the interface, and any map statements that require a different encap type can have that specified in the appropriate map statement. In the following example, all PVCs will use the default Cisco encapsulation type except for PVC 115. The frame map statement using that PVC has ietf specified.
R1(config)#int s0/0
R1(config-if)#encap frame
R1(config-if)#frame map ip 172.12.123.3 123 broadcast
R1(config-if)#frame map ip 172.12.123.2 122 ietf broadcast
show frame map shows us that the mapping to DLCI 123 is using Cisco encapsulation, and DLCI 122 is using IETF.
R1#show frame map
Serial0 (up): ip 172.12.123.3 dlci 123(0x7B,0x1CB0), static
broadcast, CISCO, status defined, active
Serial0 (up): ip 172.12.123.2 dlci 122(0x7B,0x1CB0), static
broadcast, ietf, status defined, active
Just remember that Cisco is the default, and all PVCs will use Cisco unless you specify IETF in the frame map statement itself. You could also change the entire interface to use IETF for all mappings with the frame-relay encapsulation IETF command. For Cisco exams, as well as work on production networks, it's always a good idea to know more than
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ietf Use RFC1490/RFC2427 encapsulation
R1(config-if)#encap frame ietf
What if a physical interface is in use and some remote hosts require Cisco encapsulation and others require IETF? The encapsulation type can be configured on a per-PVC basis as well. One encap type can be used on the interface, and any map statements that require a different encap type can have that specified in the appropriate map statement. In the following example, all PVCs will use the default Cisco encapsulation type except for PVC 115. The frame map statement using that PVC has ietf specified.
R1(config)#int s0/0
R1(config-if)#encap frame
R1(config-if)#frame map ip 172.12.123.3 123 broadcast
R1(config-if)#frame map ip 172.12.123.2 122 ietf broadcast
show frame map shows us that the mapping to DLCI 123 is using Cisco encapsulation, and DLCI 122 is using IETF.
R1#show frame map
Serial0 (up): ip 172.12.123.3 dlci 123(0x7B,0x1CB0), static
broadcast, CISCO, status defined, active
Serial0 (up): ip 172.12.123.2 dlci 122(0x7B,0x1CB0), static
broadcast, ietf, status defined, active
Just remember that Cisco is the default, and all PVCs will use Cisco unless you specify IETF in the frame map statement itself. You could also change the entire interface to use IETF for all mappings with the frame-relay encapsulation IETF command. For Cisco exams, as well as work on production networks, it's always a good idea to know more than
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R1(config)#int s0/0
R1(config-if)#encap frame
R1(config-if)#frame map ip 172.12.123.3 123 broadcast
R1(config-if)#frame map ip 172.12.123.2 122 ietf broadcast
show frame map shows us that the mapping to DLCI 123 is using Cisco encapsulation, and DLCI 122 is using IETF.
R1#show frame map
Serial0 (up): ip 172.12.123.3 dlci 123(0x7B,0x1CB0), static
broadcast, CISCO, status defined, active
Serial0 (up): ip 172.12.123.2 dlci 122(0x7B,0x1CB0), static
broadcast, ietf, status defined, active
Just remember that Cisco is the default, and all PVCs will use Cisco unless you specify IETF in the frame map statement itself. You could also change the entire interface to use IETF for all mappings with the frame-relay encapsulation IETF command. For Cisco exams, as well as work on production networks, it's always a good idea to know more than
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Serial0 (up): ip 172.12.123.2 dlci 122(0x7B,0x1CB0), static
broadcast, ietf, status defined, active
Just remember that Cisco is the default, and all PVCs will use Cisco unless you specify IETF in the frame map statement itself. You could also change the entire interface to use IETF for all mappings with the frame-relay encapsulation IETF command. For Cisco exams, as well as work on production networks, it's always a good idea to know more than one way to do something!
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