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  • 12:22, 22 June 2010 ‎Professional Services (hist) ‎[2,114 bytes] ‎Ivan Pepelnjak (Talk | contribs) (Created page with '{{#css:MediaWiki:Mainpage.css}} <h1>NIL's Professional Services</h1> NIL offers a wide range of professional services, ranging from auditing, technology or solution consulting, n…')
  • 17:33, 28 May 2010 ‎Conditional OSPF default route origination based on classless IP prefixes (hist) ‎[7,770 bytes] ‎Ivan Pepelnjak (Talk | contribs) (Created page with '{{Author}} {| class='prettyTable' style='margin: 1em 0' |- |'''Symptom''' |The early implementations of the ''Conditional OSPF default route origination'' feature expected a rout…')
  • 14:10, 29 March 2010 ‎Autoroute (MPLS TE) basics (hist) ‎[5,589 bytes] ‎Ivan Pepelnjak (Talk | contribs) (Created page with 'An MPLS Traffic Engineering (MPLS TE) tunnel is a unidirectional Label Switched Path (LSP) established between the tunnel head-end Label Switch Router (LSR) and tail-end LSR. Onc…')
  • 14:01, 26 February 2010 ‎Prevent DoS attacks on MPLS VPN common services (hist) ‎[11,687 bytes] ‎Ivan Pepelnjak (Talk | contribs) (New page: {{#css:MediaWiki:Sidebar.css}} <p style='font-size: 90%; margin: 0 0 0.5em 0.5em;'>,By Joe Cozzupoli and Ivan Pepelnjak</p> {|class='prettyTable' style='margin: 1em...)
  • 18:43, 8 February 2010 ‎Understanding modern VPN service offerings (hist) ‎[2,403 bytes] ‎Ivan Pepelnjak (Talk | contribs) (New page: {{#css:MediaWiki:Sidebar.css}} {{Author}} Numerous variants of IP-based VPN services have replaced the traditional Frame Relay or ATM services offered by Service Providers. The VPN service...)
  • 14:57, 15 December 2009 ‎Add MIB files to Wireshark SNMP decoder (hist) ‎[6,597 bytes] ‎Ivan Pepelnjak (Talk | contribs) (New page: {{author}} [ Wireshark]’s [ SNMP] decoder uses the [ Net-SNMP] library for [
  • 15:54, 18 October 2009 ‎Report interface loss based on OSPF neighbor loss (hist) ‎[2,994 bytes] ‎Ivan Pepelnjak (Talk | contribs) (New page: {{author}} {| class='prettyTable' |- |Description |A core router has numerous point-to-point GRE-over-IPSec tunnels with remote sites and runs OSPF with them. Tunnel keepalives are not us...)
  • 06:52, 3 October 2009 ‎Detect DHCP client address change with EEM applet (hist) ‎[3,166 bytes] ‎Ivan Pepelnjak (Talk | contribs) (New page: {{author}} {| class='prettyTable' |- |'''Symptom''' |Change in the client IP address assigned by a DHCP server to a Cisco router is hard to detect due to lack of consistent DHCP-related ''...)
  • 13:09, 26 August 2009 ‎Disable flapping BGP neighbors (hist) ‎[2,568 bytes] ‎Ivan Pepelnjak (Talk | contribs) (New page: {{author}} {| class='prettyTable' |- |Symptom |BGP protocol specifications require a BGP router to use BGP notification messages to reject invalid routing updates, updates with incorrect ...)
  • 10:43, 14 August 2009 ‎Regular expressions in Embedded Event Manager applets (hist) ‎[9,564 bytes] ‎Ivan Pepelnjak (Talk | contribs) (New page: {{author}} Cisco IOS Embedded Event Manager (EEM) release 3.0 (first available in IOS release 12.4(22)T) added support for [
  • 08:43, 14 August 2009 ‎DHCP client address change (hist) ‎[11,513 bytes] ‎Ivan Pepelnjak (Talk | contribs) (New page: {{author}} The DHCP protocol specifications do not specify the exact mechanisms a DHCP server can use to force the address change on the DHCP client. It’s assumed that once a DHCP client...)
  • 07:07, 2 August 2009 ‎Type-1 (Router) LSA (hist) ‎[11,330 bytes] ‎Ivan Pepelnjak (Talk | contribs) (New page: {{#css:MediaWiki:Sidebar.css}} {{author}} The OSPF type-1 (router) LSA describes an OSPF router, its stub interfaces and links to adjacent OSPF routers in the same area. {{Important|1=Imp...)
  • 10:29, 23 July 2009 ‎OSPF flooding filters in hub-and-spoke environment (hist) ‎[12,446 bytes] ‎Ivan Pepelnjak (Talk | contribs) (New page: {{#css:MediaWiki:Sidebar.css}} {{author}} The OSPF flood reduction functionality configured with the '''ip ospf database-filter all out''' interface configuration command can be used to re...)
  • 06:16, 16 July 2009 ‎IOS Access List numbering scheme (hist) ‎[3,802 bytes] ‎Ivan Pepelnjak (Talk | contribs) (New page: {{author}} The simple CLI parser implemented in early releases of Cisco IOS recognized only numbered access lists. The protocols supported early in the Cisco IOS history were thus using nu...)
  • 07:57, 8 July 2009 ‎Aggressive BGP fall-over behavior (hist) ‎[10,185 bytes] ‎Ivan Pepelnjak (Talk | contribs) (New page: {{author}} <includeonly>[ BGP support for Fast Peering S...)
  • 12:07, 7 July 2009 ‎PPPoE testbed (hist) ‎[6,687 bytes] ‎Ivan Pepelnjak (Talk | contribs) (New page: {{#css: .prettyTable pre { border:medium none; margin:0; padding:0.2em 1em; } table.prettyTable td { padding: 0 5px 0 0; } }} A router running Cisco IOS can act as a PPPoE client or serv...)
  • 06:47, 5 July 2009 ‎Trigger EEM applets with SNMP Informs (hist) ‎[7,359 bytes] ‎Ivan Pepelnjak (Talk | contribs) (New page: {{author}} Event Manager version 2.4 (first available in Cisco IOS release 12.4(20)T) added the '''snmp-notification''' event, which triggers an EEM applet (or Tcl policy) when the router ...)
  • 10:41, 21 June 2009 ‎Unnumbered Ethernet VLAN interfaces (hist) ‎[5,849 bytes] ‎Ivan Pepelnjak (Talk | contribs) (New page: {{author}} IOS releases 12.3T, 12.4, 12.2SXE, 12.2SB and 12.2SR support unnumbered Ethernet VLAN interfaces. This feature can help you save IP address space as you’re replacing point-to-...)
  • 15:23, 8 June 2009 ‎IS-IS in OSI protocol stack (hist) ‎[1,352 bytes] ‎Ivan Pepelnjak (Talk | contribs) (New page: {{#css:MediaWiki:Sidebar.css}} {{author}} Numerous sources on the Internet claim that IS-IS runs on top of OSI’s Connectionless Network Protocol (CLNP). This is not the case; although I...)
  • 05:42, 8 June 2009 ‎Filter excessively prepended BGP paths (hist) ‎[6,484 bytes] ‎Ivan Pepelnjak (Talk | contribs) (New page: {{author}}{| class='prettyTable' |- |'''Short<br />description''' |BGP AS-path prepending is commonly used to influence BGP path selection in upstream autonomous systems, forcing the upst...)
  • 12:36, 30 May 2009 ‎EIGRP next hop processing (hist) ‎[18,116 bytes] ‎Ivan Pepelnjak (Talk | contribs) (New page: {{#css:MediaWiki:Sidebar.css}} {{author}} EIGRP routing updates have always contained the ''next hop'' field, which was unused until Cisco IOS release 12.3 when the '''no ip next-hop-self ...)
  • 17:22, 14 May 2009 ‎Multihomed IP hosts (hist) ‎[6,664 bytes] ‎Ivan Pepelnjak (Talk | contribs) (New page: {{author}} IP host (workstations, servers or communication equipment) is ''multihomed'' if it has more than one IP address. [ RFC 1122] (Requirements for ...)
  • 18:02, 4 May 2009 ‎Flexible Extranet Implementation (hist) ‎[1,350 bytes] ‎Ivan Pepelnjak (Talk | contribs) (New page: {{author}}Traditional IP-based extranets force IP addressing on its participants: each site participating in the extranet has a fixed IP address range from the IP address space used by the...)
  • 17:58, 4 May 2009 ‎Multi-VRF based VPN (hist) ‎[1,211 bytes] ‎Ivan Pepelnjak (Talk | contribs) (New page: {{author}}The Multi-VRF functionality allows you to implement multiple independent routing tables on a single physical router without full-blown MPLS VPN functionality. Each VRF (or the gl...)
  • 17:52, 4 May 2009 ‎OSPF default routes (hist) ‎[1,316 bytes] ‎Ivan Pepelnjak (Talk | contribs) (New page: OSPF has numerous, sometimes confusing and contradicting default routing options. The default routes OSPF routes can generate include: * External default route, advertised as type-5 LSA i...)
  • 17:46, 4 May 2009 ‎OSPF graceful shutdown (hist) ‎[1,196 bytes] ‎Ivan Pepelnjak (Talk | contribs) (New page: {{author}} The OSPF Stub Router Advertisement feature introduced in IOS releases 12.0S, 12.2T and 12.3 allow you to gracefully remove an OSPF router from the network without impacting the ...)
  • 17:40, 4 May 2009 ‎Scalable Policy Routing (hist) ‎[1,178 bytes] ‎Ivan Pepelnjak (Talk | contribs) (New page: Common implementation of policy routing in Cisco IOS is performed within a single device and requires a complex configuration mix of access-lists and route-maps. In a larger network where ...)
  • 20:12, 2 May 2009 ‎Bidirectional Forwarding Detection (BFD) (hist) ‎[1,776 bytes] ‎Ivan Pepelnjak (Talk | contribs) (New page: {{author}} Bidirectional Forwarding Detection (BFD) is a UDP-based layer-3 protocol that provides very fast routing protocol independent detection of layer-3 next hop failures. BFD can be...)
  • 19:52, 2 May 2009 ‎Network Time Protocol (NTP) (hist) ‎[2,111 bytes] ‎Ivan Pepelnjak (Talk | contribs) (New page: {{author}} Virtual Private Networks (VPNs) implemented with IPSec and the [ public key infrastructure (PKI) based on X.509 certificates] require that all ...)
  • 13:20, 2 May 2009 ‎Fast BGP neighbor loss detection (hist) ‎[1,613 bytes] ‎Ivan Pepelnjak (Talk | contribs) (New page: Cisco IOS implementation of Border Gateway Protocol (BGP) has always tried to detect external BGP neighbor loss through signaled by the loss of a directly connected interface. The ''fast e...)
  • 13:19, 2 May 2009 ‎IP event dampening (hist) ‎[987 bytes] ‎Ivan Pepelnjak (Talk | contribs) (New page: The requirement for very fast network convergence caused by voice-data integration has prompted many network designers to tune their routing protocols for faster convergence. The resulting...)
  • 13:17, 2 May 2009 ‎EIGRP Stub Routers (hist) ‎[791 bytes] ‎Ivan Pepelnjak (Talk | contribs) (New page: Enhanced Interior Gateway Routing Protocol (EIGRP) behaves disappointingly in inadequately designed networks due to the distributed nature of its route computation algorithm (DUAL). Worst-...)
  • 13:16, 2 May 2009 ‎Unequal-cost load balancing with MPLS Traffic Engineering (hist) ‎[512 bytes] ‎Ivan Pepelnjak (Talk | contribs) (New page: EIGRP and BGP are the only routing protocols that support load balancing across unequal-cost paths. Almost equivalent performance can be achieved in OSPF- or IS-IS-based networks using par...)
  • 09:09, 2 May 2009 ‎BGP Load Balancing (hist) ‎[1,157 bytes] ‎Ivan Pepelnjak (Talk | contribs) (New page: {{author}}Early Cisco IOS releases did not support load balancing in networks using Border Gateway Protocol (BGP) as their core routing protocol. The BGP implementation in Cisco IOS has ev...)
  • 08:46, 2 May 2009 ‎Router Configuration Management (hist) ‎[4,745 bytes] ‎Ivan Pepelnjak (Talk | contribs) (New page: {{author}} Cisco IOS releases 12.3(14)T and 12.4 include fundamental router configuration management tools that the network engineers have been sorely missing for the last 20 years. The co...)
  • 20:17, 1 May 2009 ‎Small site multihoming (hist) ‎[3,603 bytes] ‎Ivan Pepelnjak (Talk | contribs) (New page: {{author}}A multihomed site is a customer site connected with (at least) two uplinks to one or more Internet Service Providers (ISP). Traditionally, a multihomed site needs its own provide...)
  • 15:04, 1 May 2009 ‎Manage router configurations on a web server (hist) ‎[1,267 bytes] ‎Ivan Pepelnjak (Talk | contribs) (New page: {{author}} Starting with IOS release 12.3(2)T, you can download and upload software and configuration of your Cisco router to a web server, greatly simplifying router management and enabli...)
  • 07:09, 27 April 2009 ‎IOS image selection and boot process (hist) ‎[3,036 bytes] ‎Ivan Pepelnjak (Talk | contribs) (New page: {| class='prettyTable' |- |Symptom |IOS image takes longer than expected to boot or the IOS boot process fails due to memory exhaustion with a message similar to <code>%SYS-3-IMAGE_TOO_BI...)
  • 10:17, 26 April 2009 ‎OSPF Router ID selection algorithm (hist) ‎[3,030 bytes] ‎Ivan Pepelnjak (Talk | contribs) (New page: {{author}} Every OSPF process running in Cisco IOS requires a router-wide unique router ID. An IP address of an active interface is commonly used as the OSPF router ID; you can also use th...)
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