Classless routing vs classful routing

Router routes traffic based on the longest prefix, and cannot find any match traffic will be dropped. Classless routing The routing that we normally understand is classless routing. Let's explore the routing tables of R1 and R2. R1 pings to 10.10.10.2 because a specific static route 10.10.10.2 is in the routing table R1 can ping … Continue reading Classless routing vs classful routing

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Unetlab: Backup static route is not used when peer router’s interface is down

Topology Background In GNS3 or in unetlab when the peer router's (seemed) directly connected interface is down, your local router interface is still up. This is because the so-call directly connected is connected via a virtual bridge. In this lab I have created floating static route to simulate uRPF scenario, however because R1 does not … Continue reading Unetlab: Backup static route is not used when peer router’s interface is down

OSPF virtual link with message digest authentication

Dis-contiguous area Non-backbone area has to be converged with backbone area (area 0) in order for OSPF to learn the routes. The following example has area 100 discontiguous with backbone area, the solution is either to use GRE tunnel or virtual link. Virtual link 1. Router-id is used for virtual-link neighbor not the IP address … Continue reading OSPF virtual link with message digest authentication

Palo Alto Networks: OSPF and L3 Link aggregation

The previous post about Cisco VSS is to integrate with Palo Alto Firewalls. Layer 3 link aggregation on PA firewall Click on Network tab and select Interfaces from the menu on the left. There is an "Add Aggregate Group" at the bottom of the page, it may seem quite unnoticeable. After the link aggregation link … Continue reading Palo Alto Networks: OSPF and L3 Link aggregation