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For questions about OSPF. Open Shortest Path First (OSPF) is a link-state routing protocol for Internet Protocol (IP) networks.

state info or does it send the LSA it has received from other router? Remember that there is a fundamental rule in OSPF, there must always be a leg in the backbone area(A0). A router that connects to …
answered Jan 11 '18 by DRP
if you meant Type 3 LSA's, however let us recall that OSPF routers in the same area need to have identical LSDB, by this I mean that they will share all LSA's they know about and which are permitted … indeed takes effect with the usage of DBD packets as well as Type 3, 4 and 5 packets. let's see what each one contains: Database description - Type 2 OSPF Header Sequence Number LSA Header Link-state …
answered Jan 7 '18 by DRP
From first question: Regarding an OSPF topology, when a link failed, some new LSA will be send, and flooded by all routers (or DR) in the area. What is the type of packet ? Link-state Update … second question: Also, regarding the initialization phase of OSPF, the new adjacencies if performed with neighbors, so Database Description packets are transmit and then LS Request and then LS …
answered Jan 7 '18 by DRP
Correct, OSPF uses five packet types: Hello - Type 1 Database description - Type 2 Link-state request - Type 3 Link-state update - Type 4 Link-state acknowledgement - Type 5 Seven adjacency … also ensures that communication between neighbors is bidirectional." Exstart Exchange Loading Full Remember that at the Exchange step the DBD packet has the OSPF header plus the LSA header …
answered Jan 3 '18 by DRP
Implement IBGP with a lower preference than OSPF and import summary routes narrow with a route-filter policy and define additional BGP attributes with the algorithm based on your need. RPM with …
answered Apr 18 '17 by DRP
If you are a math type of person you may want to understand Dijkstra algorithm. Reading RFC2328 as mentioned by Ron is best option. If you are looking for a short down and dirty contribution I'll pu …
answered Jan 5 '18 by DRP
First question answer cisco learningnetwork Second question answer rfc2328 If still with doubts, let us know. Cheers!
answered Jan 1 '18 by DRP
For further understanding let me dissect the capture you shared, this can improve understanding. How do we interpret LSU in OSPF? A OSPF packet header which is part of the packet fields of … an LS Update. Contains: version#, type, packet lenght, router id, area id, checksum, autype, authentication. B Link State packet (Type 4), out of the 5 OSPF packet types. C The LS Update packet carries …
answered Jan 11 '18 by DRP
So, why to use also MPLS if we already had OSPF? Downsides of IGP Metric based: There will be a segment underutilized as you can see from the link cost. Traffic for the different networks …
answered Jan 29 '18 by DRP
Both routes were External type 2, advertised the route as an OSPF E1, E1 is always preferred over E2 and this solved the issue. …
answered Feb 3 '18 by DRP