Category Archives: Route

Here will categorize things about routers

Palo Alto Networks: OSPF and L3 Link aggregation

Posted on December 21, 2012 by

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 … Continue reading →

Posted in Firewall, OSPF, Route, Security | Tagged , , , , | 4 Comments

Palo Alto Networks: Default route in command line

Posted on December 14, 2012 by

Suppose your virtual-router profile has to be applied on both layer3 interfaces you can do the following configuration in command line.

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ISIS – Maximum path

Posted on December 5, 2012 by

Today my friend asked me why he could not see all the vlans available in IS-IS when he issued show ip route isis command. When I saw it, it turned out that there are four paths leading to the same … Continue reading →

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BGP: Route reflector

Posted on June 14, 2012 by

Split horizon Split horizon rule is to prevent routing loop. In iBGP a router which learns prefixes from a BGP speaker will not advertise to BGP speaker, this makes a full mesh iBGP peering necessary in order for other BGP … Continue reading →

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MPLS: OSPF sham-links

Posted on June 1, 2012 by

Introduction The provider’s MPLS cloud has three routers namely – R1 (P-router), R2 (PE-R2) and R3 (PE-R3). These routers formed OSPF adjacency with one another. R2 and R3 are iBGP neighbors peering with each other’s loopback address. The TTL propagation … Continue reading →

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Intermediate System-Intermediate System Basics

Posted on May 24, 2012 by

Conditions to form IS-IS adjacency 1. MTU must match. 2. IS level must match. Level 1 and level 1 router can form adjacency, level 1 router can form adjacency with level1/2 router this is because this router has two IS … Continue reading →

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MPLS Layer 3 VPN

Posted on May 24, 2012 by

Acknowledgement Without MR.Keith Barker’s 21 minutes video instruction, constructing MPLS VPN lab will take a longer time. His 21 minutes video instruction summarizes all. MR. Keith Barker has amazing skills to translate complicated concepts into simpler and easier to understand … Continue reading →

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BGP: Injecting IGP route into BGP without redistribution

Posted on May 22, 2012 by

The diagram is complicated with an additional link, and instead of full BGP route in AS65000, the BGP route is propagated with the help of OSPF. In previous lab, the BGP full mesh was established by peering both subnets of … Continue reading →

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BGP: Route filter with ip prefix-list

Posted on May 20, 2012 by

Using the same network diagram, I would want prefix 10.20.0.0 to be filtered from advertisement by the border iBGP routers (r1 and r3). Using prefix-list is a more granular method than using ACL with distribute-list. Hide r2 prefixes from r5 … Continue reading →

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BGP: Full mesh BGP without IGP

Posted on May 20, 2012 by

r1, r2 and r3 have full meshed BGP peering. No IGP was used. BGP synchronization Before a BGP route is advertised and added to the routing table, this route must be known via an IGP. For the case of AS65000, … Continue reading →

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