Jan 31, 2023 · Specifically, it demonstrates the difference between the terms "OSPF neighbor relationship" and "without forming an adjacency"(although those terms are less than ideal when describing OSPF neighbors). An OSPF adjacency is where the two routers exchange their LSDB (Link State Database) with each other and reach the FULL state in the adjacency state machine. 49/30, Area 0, Attached via Network Statement OSPF allows a routers to form adjacency with other routers in a single area. Adjacencies go further than neighbours, by sharing information through LSA messages. The Adjacency table is a seperate entitity to the FIB table. 2. I forgot to add that this logs on SW1 is reoccurring, not just minute but more than an hour that the flaps occurred. Routers in the 2-Way state are neighbours routers in ExStart, Exchange, Loading, and Full are adjacent. . The subnet prefix points to a glean adjacency. No sudden drops on the utilization during the flap of PIM adjacency. I propose the missing figure (multiaccess segment) would be similar to the one depicted below (image is clickable). The Adjacency table is a seperate entitity to the FIB table. So what i can think of is since the congestion occurred this affect the hello pim packets that being sent by sw2. This means that two routers that are adjacent are also neighbours but two routers that are neighbours may not be fully adjacent. Each router via its interface connect to networks/subnets. Neighbourships will send hello messages and process received hello messages. Why does it need to form adjacency? Glean adjacency - When a router is connected directly to several hosts, the FIB table on the router maintains a prefix for the subnet rather than for the individual host prefixes. Josh hivipinvv Edited by Admin February 16, 2020 at 2:50 AM Layer 2 adjacency is when two or more devices need to be in the same VLAN, This leads to design complexity in order to extend these VLANs across multiple downstream switches. Expand Post kevinjamesomahony Hi Tigger As requested , I have captured a debug as this is production and debugs in prod scare me if it comes to it out of hours I will grab one DC#sh ip ospf int vlan212 Vlan212 is up, line protocol is up Internet Address 10. 34. The conecpts are quite difficult to get you head around once you first see it but i went off and read some extra stuff to try and understand it more and cam across the link below if i remember debug ip ospf adjacency . When packets need to be forwarded to a specific host, the adjacency database is gleaned for the specific prefix. 1. There's a very subtle difference here. Here my inputs regarding your comment. I did clear the processes on both R1 and R4 like Ramon mentioned, but adjacency is still not forming on the segment. The purpose to form adjacency is so that each router in that area is aware of the networks the other router is connected to. 1. the adjacency table GETS the information from the FIB table as shown in my original post. So, two routers need to be neighbours before they can be adjacent. When I do try the same lab in packet tracer, I get no issues.

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