Cisco Updated 300-410 Exam Questions and Answers by dean

Diagram Description automatically generated

The MPLS LDP Inbound Label Binding Filtering feature can be used to control the amount of

memory used to store Label Distribution Protocol (LDP) label bindings advertised by other

devices. For example, in a simple Multiprotocol Label Switching (MPLS) Virtual Private Network

(VPN) environment, the VPN provider edge (PE) devices might require label switched paths

(LSPs) only to their peer PE devices (that is, they do not need LSPs to core devices). Inbound

label binding filtering enables a PE device to accept labels only from other PE devices.

After redistribution, R3 learns about network 10.1.1.0/24 via two paths:

+ Internal BGP (IBGP): advertised from R4 with AD of 200 (and metric of 0)

+ OSPF: advertised from R1 with AD of 110 (O E2) (and metric of 20)

Therefore R3 will choose the path with the lower AD via OSPF

But this is a looped path which is received from R3 -> R2 -> R1 -> R3. So when the advertised route

from R4 is expired, the looped path is also expired soon and R3 will reinstall the main path from R4.

This is the cause of intermittent connectivity.

We can solve this problem by denying the 10.1.1.0/24 prefix from being redistributed into OSPF on

R1. So R3 will not learn this prefix from R1.

Or another solution is to place an OSPF distribute-list inbound on R3 to block the 10.1.1.0/24 prefix

from being advertised back to R3.

https://community.cisco.com/t5/other-network-architecture/out-of-band-router-access/td-p/333295

The “transport output none” command prevents any protocol connection made from R1.

Therefore our SSH connection to 192.168.12.2 was refused. In order to fix this problem we can

configure “transport output ssh” under “line console 0” of R1.

Note: The parameter “-l” specifies the username to log in as on the remote machine.