Shahed Israr

Shahed Israr is a Network Engineer specializing in GPON, FTTH, and telecom access network technologies. With hands-on experience in Huawei OLT and ONT configuration, U2000 NMS deployment, iMaster NCE-FAN Lite management systems, firmware upgrades, and advanced network troubleshooting, he helps Internet Service Providers (ISPs) and network professionals deploy, manage, and optimize fiber optic networks efficiently. Through GPON Solution, he shares practical technical guides, real-world solutions, and professional knowledge to support engineers working in modern GPON infrastructure.

How to stop repeat Ping command ?

October 30, 2015November 4, 2011 by Shahed Israr

How to stop repeat Ping command ? Which command you are trying to stop/Break repeat ping when you face problem cisco Switch/Router. [bodyads] Don’t worry please try bellow command, it’s work successfully. Hold down Ctrl+shift+6, release and then press x immediately. This may work depending on your IOS.

Which types of command used to ping a host continuously?

October 29, 2015November 4, 2011 by Shahed Israr

Which types of command used to ping a host continuously? You can ping from cmd by typing: c:\>ping [-t] [-a] [-n count] [-l size] [-f] [-i TTL] [-v TOS] [-r count] [-s count] [[-j host-list] | [-k host-list]] [-w timeout] target_ip/name [boxads] Source(s): Options: -t Ping the specified host until stopped. To see statistics and … Read more

MPLS VPN Components basic knowledge

October 24, 2015September 1, 2011 by Shahed Israr

MPLS VPN Components:

Today I will discuss about MPLS VPN Components. It is same as MP-BGP Components. only extra Label component are added with MPLS VPN Components. [boxads]

RD: Route Distinguisher
VPNv4 routes
RT: Route Target
Label

VPNv4 address:

To convert an IPv4 address into a VPNv4 address, RD is appended to the IPv4 address i.e 1:1:10.1.1.0 Makes the customer’s IPv4 route globally unique.

Each VRF must be configured with an RD at the PE. RD is what that defines the VRF [adsense]

Example:

ip vrf v1
rd 1:1

Virtual Routing and Forwarding basics (VRF)

October 24, 2015September 1, 2011 by Shahed Israr

Virtual Routing and Forwarding basics (VRF):

Today i will discuss about Virtual Routing and Forwarding basics (VRF). VRF is a Layer 3 VPN technique. VRF can be use with or without MPLS. If we look bellow diagram we see here two VRF one is green VRF and another is blue VRF. [boxads]

Virtual Routing and Forwarding basics (VRF) Diagram:

Now one question what is VRF ?

VRF associates to one or more interfaces on PE.
Privatize an interface. [i.e. coloring of the interface in diagram]
Has its own routing table and forwarding table (CEF)
VRF has its own instance for the routing protocol (static ,RIP,BGP,EIGRP,OSPF)
CE router runs standard routing software
PE installs the routes, learned from CE routers, in the appropriate VRF routing table(s)
Also PE installs the IGP (backbone) routes in the global routing table
VPN customers can use overlapping IP addresses.

MPLS VPN Connectivity diagram

October 24, 2015September 1, 2011 by Shahed Israr

MPLS VPN Connectivity diagram:

Today i will discuss about MPLS VPN Connectivity diagram or how a MPLS VPN domain buildup in service provider environment. [boxads]

MPLS VPN domain are consist mainly P & PE router. P router means provider router, and PE router means provider edge router. P router are only forwarded Level & PE router collect & distribute customer prefixes. If we look bellow diagram we see P & PE router how connected.

MPLS VPN Connectivity diagram:

BGP Regular Expressions Cheat Sheet

October 22, 2015August 26, 2011 by Shahed Israr

BGP Regular Expressions Cheat Sheet

Regular expressions are strings of special characters that can be used to search and find character patterns. Within the scope of BGP in Cisco IOS regular expressions can be used in show commands and AS-Path access-lists to match BGP prefixes based on the information contained in their AS-Path. [boxads]

In order to understand how to build regular expressions we first need to know what the character definitions are for the regex function of IOS. The below table illustrates the regex characters and their usage. This information is contained in the Cisco IOS documentation under the Appendix of Cisco IOS Terminal Services Configuration Guide, Release 12.2.

BGP Regular Expressions Cheat Sheet:

To find all subnets originating from AS 100 (AS path ends with 100):