Cisco 2960 Switch Series: Rate limit Configuration on the Switch Port.

In the Cisco IOS on a Catalyst switch (not on a router), there’s an Interface Mode command called shape round-robin queue bandwidth. More specifically, the command is srr-queue bandwidth. This command has been around since IOS 12.2(25). For these examples, I’m using a Cisco Catalyst 2960 switch. Entering the command appended with a question mark will display the command options. Here’s… Read More »

IPv6 Design and Deployment.

The 16-bit subnet ID section of the IPv6 global unicast address can be used by an organization to create internal subnets. The subnet ID provides more than enough subnets and host support than will ever be needed in one subnet. For instance, the 16-bit section can: Create up to 65,536 /64 subnets. This does not include the possibility… Read More »

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 »

How to Shorten IPv6 Addresses.

An IPv6 address consists of 32 hexadecimal digits, in 8 sections of 4 digits each, separated by colons. It looks something like this: 1234:5678:90ab:cdef:1234:5678:90ab:cdef IPv6 addresses have several shortcuts that allow them to be compressed into smaller strings following certain rules. If there are any leading zeroes in a section, they may be left off. 0001:0001:0001:0001:0001:0001:0001:0001 could be written as 1:1:1:1:1:1:1:1. Any… Read More »

IPv6 Address Basics.

In IPv4 an address is split into two portions a network portion and a host portion.This was done initially using Address classes and later using subnet masking. In IPv6 we also have the same. The first step is to split the address into two parts. The address is split into 2 64 bit segments the first 64 bits… Read More »

IPv6 Configuration Types.

There are several different ways to configure IPv6 and the exact method depends on the network design and architecture of the business model. Static Addressing Native and using IPv6 either on its own or in a dual-stack configuration alongside IPv4. DHCPv6 Address automatically obtained by DHCPv6 to an upstream server. Prefix delegation may also be used with DHCPv6… 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 »