When Open Shortest Path First (OSPF) is enabled on a router or when a router configured for OSPF is powered up, OSPF neighbors are not known and the OSPF state is said to be init. The router then discovers other OSPF speaking routers and synchronizes its database with them. In this process, the status of the OSPF relationship between OSPF neighbors transitions through several states, ultimately changing to full state. However, at times the status of the OSPF relationship does not transition to full state and may get stuck in exstart and exchange state.
The most common reason for this problem is a mismatch in the Maximum Transmission Unit (MTU) settings. When attempting to run OSPF between a Cisco router and another vendor's router, if the default interface MTUs do not match, the router with the higher MTU sends a packet larger than the MTU set on the neighboring router. This results in the neighboring router ignoring the packet. The solution is to change the MTU on one router to match the neighbor's MTU.
To set the MTU size of IP packets sent on an interface, issue the ip mtu command in interface configuration mode.
In some instances, disabling MTU mismatch detection may be necessary. To disable OSPF MTU mismatch detection on receiving Database Descriptor (DBD) packets, issue the ip ospf mtu-ignore command in interface configuration mode.
how to connect this router (the one at the top) to the 3 switches at the bottom, these are 2 different networks with 2 different subnet masks. I did the interface encapsulation but it doesn't send packets from any pc in Sales & Marketing Network (the...
model: n9k-c93180yc-fxNetwork Management
I try configuration migrate from nexus 3548 to nexus c93180yc-fx
when I copy and paste police map but, the following error message was displayed.
(config-pmap)# class copp-...
Can't enable boost license config)#platform hardware throughput level boost not available. FLM240302GF_20220520020540.lic was installed and Version 16.8.3
Fuji I thought was the requirement, what am I missing.
Index 11 Fea...
We've got a set of Cisco 9300-24UX switches that are stacked together as a stack, running IOS-XE 17.03.03. We've several VLANs configured and used HSRP for redundancy with an adjacent stack of Cisco 9300.
We are wanting to...
See attached diagram for details. I want R2 to advertise only “10.100.254.1/32” to R3 using a route-map. How do I do this? R1/R2 are running OSPFR2/R3 are running eBGP44/r2 are running eBGP === R2 Config === interface Loopback0ip...