Before you read through this post, I assume you have got at least the basic understanding of BGP and how it works. Here are some facts: BGP is a path vector Routing Protocol works on TCP port 179. Neighbor with the lowers IP address will establish the connection to the Remote Peer on TCP port [...]
{ 3 comments }
I have came across a lot of BGP configurations where there are lot of the configurations can be optimized. But having said that, this is not always the case when the Network is being built gradually. Here is a couple of them, called Peer Session Templates and Peer Policy Templates; which we can use in [...]
{ 0 comments }
I have come across an odd scenario on pre-share key based IPSec tunnels… The question being, when an IPSec tunnel is active (Phase 1 and 2 are UP) and the pre-share key is changed, does this tear down the tunnel? The tunnel configuration on R4 follows… ! crypto isakmp policy 1 encr aes 256 hash [...]
{ 0 comments }
OSPF Loopback interfaces are treated as a stub host and will only have a 32 bit host route on the other devices no matter how the subnet mask is entered under the OSPF network statement. We will explore how we can disable this default behaviour using a few methods. As you can see, R4 is [...]
{ 1 comment }
I was going through 6to4 tunnel configs and thought I’d post some info on converting IPv4 address into IPv6 Address. This is pretty straight forward and its obviously involves HEX conversion. Method 1 (Please also see Method 2 below as I think it is much more easier) Here, I will convert the address 192.168.25.234 First [...]
{ 46 comments }
This is one of the BGP configuration I have came across on my lab… no-export : This will keep the route inside the confederation, but not to any peers. local-as : This will keep the route inside the AS, but not even to confederation peers. no-export –> local-as –> no-advertise If there is no confederation [...]
{ 0 comments }