04-20-2016 10:52 AM - edited 03-08-2019 05:25 AM
what is the default cisco router network type in
1. normal Ethernet port to Ethernet port connection: broad cast or non-broadcast?
2. serial link: i know this one is p2p
3. .... and other types plz
04-20-2016 11:40 AM
Hi George,
1-Ethernet is Broadcast
2-Serial p2p non-broadcast
3-NBMA
NBMA: simulates a broadcast model by electing a designated router (DR) and a backup designated router (BDR). There are two ways to simulate a broadcast model on an NBMA network: define the network type as broadcast with the ip ospf network broadcast interface sub-command or configure the neighbor statements using the router ospf command.
http://www.cisco.com/c/en/us/support/docs/ip/open-shortest-path-first-ospf/13690-18.html
HTH
04-21-2016 02:20 AM
Hi,
2. serial link: i know this one is p2p
it depends on the link-layer technology/encapsulation:
HDLC, PPP, Frame-Relay Point-to-Point subinterface: Point-to-Point
Frame-Relay main-interface and -Point-to-Multipoint subinterface: NBMA
3. .... and other types plz
Tunnel interfaces (GRE): Point-to-Point
HTH
Rolf
12-07-2023 03:21 AM
The OSPF network type is automatically set based on the data link layer encapsulation of the interface.
12-07-2023 05:23 AM - edited 12-07-2023 05:34 AM
Hi George-SI,
1) Ethernet or Fastethernet interfaces---> default network type Broadcast
2) Serial interfaces/Tunnel Interfaces --> default network type Point-to-Point
3)Loopback interface --> default network type Loopback
4)Fream-relay interface --> default network type NBMA (Non-Broadcast Multi-Access)
Other possible options in Frame-relay
RFC 2328-Compliant mode
Non-Broadcast (NBMA) - by default
Point-to-Multipoint
Additional Modes from Cisco
Point-to-Multipoint Non-Broadcast
Broadcast
Point-to-Point
Best regards
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