WIP: Updated bgp

acronyms.tex

@@ -156,6 +156,7 @@
 \newacronym{tlv}{TLV}{Type, Length, Value}
 \newacronym{toc}{ToC}{Table of Contents}
 \newacronym{tosdr}{ToS;DR}{Terms of Service; Didn't Read}
+\newacronym{ttl}{TTL}{Time-to-live}
 \newacronym{udld}{UDLD}{Unidirectional Link Detection}
 \newacronym{udp}{UDP}{User Datagram Protocol}
 \newacronym{utc}{UTC}{Coordinated Universal Time}

chapter/layer3.tex

@@ -7,14 +7,15 @@
 \section{EIGRP}
 \section{RIP}
 \section{Static}
+
+\newpage
+
 \section{BGP}
 
 \wikicommons{BGP_FSM}
 
 The protocol of the internet used since 1994.\cite{wiki:Border_Gateway_Protocol}
-Currently based upon \rfc{4271} with updates following in \rcf{6286} \rfc{6608}, \rfc{6793}, \rfc{7606}, \rfc{7607}, \rfc{7705}.
+Currently based upon \rfc{4271} with updates following in \rfc{6286} \rfc{6608}, \rfc{6793}, \rfc{7606}, \rfc{7607}, \rfc{7705}.
-
-
 
 \begin{itemize}
     \item \itemhead{Properties}
@@ -27,20 +28,19 @@ Currently based upon \rfc{4271} with updates following in \rcf{6286} \rfc{6608},
     \begin{itemize}
         \item \itemhead{Route-maps mechanism}
         \begin{itemize}
-            \item Routes can be aggregated between \Glspl{as}.
+            \item Routes can be aggregated between \glspl{as}.
             \item Properties can be changed on the fly by mathing
-            \begin{enumerate*}[label={\alph*)}]
+            \begin{mylist}
-                \item \Gls{bgp} communities,
+                \item \gls{bgp} communities,
-                \item \Gls{ip} prefix,
+                \item \gls{ip} prefix,
-                \item \Gls{bgp} as-path, 
+                \item \gls{bgp} as-path, 
-            \end{enumerate*}
+            \end{mylist}
         \end{itemize}
-        \item 
     \end{itemize}
     \item \itemhead{States}
     \begin{enumerate}
-        \item Idle: \Gls{bgp} while initializing refuses all incoming connections. Will initiate \Gls{tcp} connection to peer.
+        \item Idle: \gls{bgp} while initializing refuses all incoming connections. Will initiate \gls{tcp} connection to peer.
-        \item Connect: Waits for \Gls{tcp} connection. If \Gls{tcp} is established goes to state OpenSent. If \Gls{tcp} is \textit{un}successful ConnectRetry timer is started and then goes to Active state.
+        \item Connect: Waits for \gls{tcp} connection. If \gls{tcp} is established goes to state OpenSent. If \gls{tcp} is \textit{un}successful ConnectRetry timer is started and then goes to Active state.
         \item Active: When ConnectRetry counter reaches 0 goes to state Connect.
         \item OpenSent: Sends \gls{msg} to remote node. Waits for reply \gls{msg} before going to OpenConfirm.
         \item OpenConfirm: Nodes exchange keepalive \glspl{msg} and goes to Established state if successful.
@@ -48,4 +48,21 @@ Currently based upon \rfc{4271} with updates following in \rcf{6286} \rfc{6608},
     \end{enumerate}
 \end{itemize}
 
+\subsection[iBGP]{Internal Border Gateway Protocol}
 
+\gls{ibgp} is running \gls{bgp} within the same \gls{as} between routers. Much like running a general \gls{igrp} in the network.
+
+Tradition one has to be fearful of creating \textit{routing loops} in the network. \glspl{bgp} mechanism for this is using either \begin{mylist} \item Full Mesh, or \item \glspl{rr} \end{mylist}.
+
+Problems by running \textit{Full Mesh} is the formula of \[ iBGPsessions = n*(n-1)/2 \] \note{where $ n $ is the number \gls{ibgp} speakers} which results in scaling problems as \gls{ibgp} speakers are added to the \gls{as}.
+
+\textit{\glspl{rr}} solves this problem by peering with all \gls{ibgp} speakers in the \gls{as}. All \gls{ibgp} speakers are then clients of the \glspl{rr}. This in turn helps maintainability by also advertising routes learnt from \gls{ibgp} clients to clients. Classic filtering/mathing route-maps/prefix-filters can be used to \textit{not} advertise all routes select group of clients from the \glspl{rr}.
+
+\subsection[eBGP]{External Border Gateway Protocol}
+
+\gls{ebgp} connections is inherently different from \gls{ibgp} connections. Some assumptions are made such as
+\begin{enumerate}
+    \item a \gls{ttl} of 1 is the default\footnote{Multi-hop \gls{ebgp} can thou be configured},
+    \item distance is set to 20 compared to 200 for \gls{ibgp} routes,
+    \item Next hop does \textit{not} change for \gls{ebgp} routes advertised to \gls{ibgp} neighbours.
+\end{enumerate}

commands.tex

@@ -129,3 +129,8 @@ License: \texttt{\href{https://creativecommons.org/licenses/by-sa/3.0/}{CC BY-SA
 
 % Usage:
 \newcommand{\rfc}[1]{RFC #1\footnote{\href{https://tools.ietf.org/html/rfc#1}{tools.ietf.org/html/rfc#1}}}
+
+
+% Usage: \note{<text>} or \nb{<text>}
+\newcommand{\note}[1]{{\color{Mahogany!20!black}{\small(#1)}}}
+\newcommand{\nb}[1]{\note{#1}}

references-websites.bib

@@ -2,14 +2,23 @@
     author = "Hector Camba Lainez",
     title = "Cap4 implementing vtp",
     year = "2010",
-    url = {https://www.slideshare.net/lucky0679/cap4-implementing-vtp},
+    url = {\url{https://www.slideshare.net/lucky0679/cap4-implementing-vtp}},
     note = "[Online; accessed 22-May-2017]"
 }
 
 @misc{ web:SP_Tiers,
-   author = "Orhan Ergun",
+    author = "Orhan Ergun",
-   title = "{Tier 1,Tier 2 and Tier 3 Service Providers - Tier and BGP Peering} --- Orhanergun.net",
+    title = "{Tier 1,Tier 2 and Tier 3 Service Providers - Tier and BGP Peering} --- Orhanergun.net",
-   year = "2017",
+    year = "2017",
-   howpublished = {\url{https://orhanergun.net/2017/01/tier-1-tier-2-tier-3-service-providers/}},
+    howpublished = {\url{https://orhanergun.net/2017/01/tier-1-tier-2-tier-3-service-providers/}},
-   note = "[Online; accessed 17-June-2017]"
+    note = "[Online; accessed 17-June-2017]"
 }
+
+@misc{ Differen15:online,
+    author = {\url{http://www.differencebetween.com/author/root/}{Andrew}},
+    title = "Difference Between EBGP and IBGP",
+    howpublished = {\url{http://www.differencebetween.com/difference-between-ebgp-and-vs-ibgp/}},
+    month = "September",
+    year = "2011",
+    note = "[Online; accessed on 24-June-2017]"
+}