Nikolay Abromov blog

http://www.mellanox.com/

reminder to read this article: http://www.juniper.net/techpubs/en_US/junos11.4/topics/topic-map/mcast-pim-rpt-spt-cutover.html

I got this strange behaviour where the IPv6 doesn't work correctly or not working at all on LT interfaces. http://www.juniper.net/techpubs/en_US/junos12.2/topics/concept/logical-systems-restrictions.html Logical systems have the following operations and restrictions: * You can configure only Frame Relay interface encapsulation on a logical tunnel interface ( lt- ) when it is configured with an IPv6 address. So if you are using Logical Systems on Juniper and you have to do IPv6 labs avoid encapsulation ethernet. Example root@jnlab# show interfaces {     lt-2/2/0 {         unit 46 {             encapsulation frame-relay;             dlci 100;             peer-unit 45;             family inet {                 address 172.27.0.58/30;             } ...

Configuring Node-Link Protection for OSPF You can configure node-link protection on any interface for which OSPF is enabled. Node-link protection establishes an alternate path through a different routing device altogether for all destination routes that traverse a protected interface. Node-link protection assumes that the entire routing device, or node, has failed. The Junos OS therefore calculates a backup path that avoids the primary next-hop routing device. Node-link protection is supported on: OSPFv2 and OSPFv3 interfaces OSPFv3 unicast realms OSPFv2 unicast topologies All routing instances supported by OSPFv2 and OSPFv3 Logical systems To configure node-link protection for an OSPF interface: Include the  node-link-protection  statement at the  [edit protocols (ospf | ospf3) area  area-id interface  interface-name ]  hierarchy level. Best Practice:  You must also configure a per-packet load-balancing routing policy to ensure t...

IRC Freenode is something really useful. It's amazing that people still prefer to use a real-time chat services rather than forums and mailing lists.

It's really lovely how straight-forward the JunOS conditional routing is. There is a quick example how to configure it. In the example we are monitoring the IS-IS route 172.27.255.2/32 and if it's in the routing table we will generate 172.27.0.0/16 route. The important bit here is the generate route and the policy which is in the end of the 'generate route' statement. [edit logical-systems r1 routing-options] root@m# show generate { route 172.27.0.0/16 policy isis-present; } policy-statement isis-present { term 1 { from { protocol isis; level 1; route-filter 172.27.255.2/32 exact; } then accept; } term 2 { then reject; } }

##################################################################################################### ## ISIS ##################################################################################################### # Be sure to set family iso on the interface to be placed into ISIS set interfaces <interface> family iso # By default Junos places interfaces as L1/L2 # Default route leaking:         L1 to L2 - all internal routes         L2 to L1 - 0/0 route # L1/L2 will send the attached-bit down to L1 and it will act as a NSSA-like area.  When the L1 interface # receives the attached-bit it will inject a 0/0 route into the RIB point to the L1/L2 interface. # To disable the attached bit use: set protocols isis ignore-attached-bit # Be careful with the "interface all" command, as it may have some unexpected consequences such as trying # to establish a neighbor on your fxp0 management...

I just purchased the new Service Provider workbook from InetZero and I hope it's worthy the price of 300GBP

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Nice article by Damon Wischik 1. Introduction Today, the buffer size in core Internet routers is typically chosen according to a rule of thumb which says: provide at least one round trip time's worth of buffering. The round trip time is often taken to be around 250ms (it takes 134ms to send a packet half way round the world and back, but queueing delay may plausibly add 100ms). A 40Gb/s linecard therefore needs 1.25GByte of memory. Such large memories are hard to build in electronics. (The problem is that data can arrive at line rate, so the memory needs to be writeable at line rate. Such a high memory bandwidth is hard to engineer—and DRAM access speeds increases at only 7.5% a year [6].) Such large memories are also wildly impractical for any all-optical router that we can conceive of today. Recent theoretical work has challenged the rule of thumb: it seems that a buffer of just 20 packets should be sufficient. The modeling behind this deals with TCP's ...

Topology for practice. I am using LT interfaces to interconnect the logical  systems. 

more:  http://www.openflow.org/wk/index.php/MPLS_with_OpenFlow/SDN

It's always bad when you lose someone close.  This is my grandma. She past away Today (18/06/2012). She was one of the most amazing people in my life.  

This are just a topics I need to start building lab scenarios for. If you read this BLOG - please ignore that bit.  Device Administration Class of Service Open Shortest Path First (OSPF) Intermediate System to Intermediate System (IS-IS) IPv6 Border Gateway Protocol (BGP) Multicast in the provider core Multi-Protocol Label Switching (MPLS) Layer 3 VPNs Layer 2 VPNs Virtual Private LAN Switching (VPLS) Next generation multicast VPNs (NG-MVPN) OSPF Describe the concepts, operation and functionality of OSPF Various OSPF LSA types Flooding of LSAs in an OSPF network SPF algorithm OSPF metrics, including external metric types OSPF authentication options OSPF area types and operations, including stub areas and NSSAs Summarize and restrict routes Purpose of virtual links Key differences between OSPFv2 and OSPFv3 Demonstrate knowledge of how to configure and monitor single-area and multi-area OSPF Implement OSPF routing policy IS-IS Des...

The next step is to bring the virtual-routers and do something useful with these two gears. root@m120_lab_01> show version         Hostname: m120_lab_01 Model: m120 JUNOS Base OS boot [11.4R3.7] JUNOS Base OS Software Suite [11.4R3.7] JUNOS Kernel Software Suite [11.4R3.7] JUNOS Crypto Software Suite [11.4R3.7] JUNOS Packet Forwarding Engine Support (M/T Common) [11.4R3.7] JUNOS Packet Forwarding Engine Support (M120) [11.4R3.7] JUNOS Online Documentation [11.4R3.7] JUNOS Voice Services Container package [11.4R3.7] JUNOS Border Gateway Function package [11.4R3.7] JUNOS Services AACL Container package [11.4R3.7] JUNOS Services LL-PDF Container package [11.4R3.7] JUNOS Services PTSP Container package [11.4R3.7] JUNOS Services Stateful Firewall [11.4R3.7] JUNOS Services NAT [11.4R3.7] JUNOS Services Application Level Gateways [11.4R3.7] JUNOS Services Captive Portal and Content Delivery Container package [11.4R3.7] JUNOS Services RPM [11.4R3.7...