Category Archives: TOPICS

IPv6 Deployement and Subnetting.

Suppose there is IP version 6 address 2001:1D11:220A::/48 assigned to an ISP with 16-bit subnet ID. The network administrators can subnet the IP version 6 address just counting /16-bit subnet ID in hexadecimal. This would allow the administrator to create 65,536 /64 subnet. The table below illustrates the subnetting procedure of IPv6 address. IPv6 Range. 2001:1D11:220A:0000::/48 2001:1D11:220A:0001::/48 2001:1D11:220A:0002::/48 2001:1D11:220A:0003::/48… Read More »

IPv6 SUbnetting.

In IPv4, the subnet mask is 32 bits and consists of four 8-bit octets. The address: subnet mask means that the subnet is a range of IP addresses from – The prefix-length in IPv6 is the equivalent of the subnet mask in IPv4. However, rather than being expressed in four octets like it is in IPv4, it is expressed as… Read More »

Default Route blocking for advertisements to downstream peers in BGP #Huawei

I want to allow all other routes but not the default routes to my downstream BGP peers. Step-1= Create the Prefix list. ip ip-prefix NO-DEFAULT-ROUTE index 10 deny 0ip ip-prefix NO-DEFAULT-ROUTE index 20 permit 0 less-equal 32 Step-2=Route-Policy Creation route-policy NO-DEFAULT-ROUTE permit node 10if-match ip-prefix NO-DEFAULT-ROUTE Step-3= Apply on Peers. bgp <ASN>peer <ip> as-number <ASN>peer <ip>… Read More »

Introduction Of BGP.

BGP is an Exterior Gateway Routing Protocol and BGP is used for exchanging the routing information between the auto system numbers. Let’s look into some of the BGP’s basic features. BGP Keypoints..! BGP is a Path Vector Protocol. BGP is an open standard protocol. BGP is an exterior gateway routing protocol and it is designed for inter-AS domain… Read More »

BGP & ASN Intro.

BGP is an exterior gateway routing protocol and it is used to exchange the routes or prefixes between the AS Numbers on the internet. Before I go ahead let me tell you 3 RFCs to read and also you can read Jeff Doyles TCP/IP Vol-2, This book is one of my favorite and very easy to understand.RFC4271RFC4276RFC4277 Before… Read More »