API Guide

Peer templates allow BGP neighbors to inherit the same outbound policies. Instead of manually configuring each neighbor with
the same policy, you can create a peer group with a shared policy that applies to individual peers. A peer template provides
efficient update calculation with a simplified configuration.
Peer templates also aid in convergence speed. When a BGP process sends the same information to many peers, a long output
queue may be set up to distribute the information. For peers that are members of a peer template, the information is sent to one
place then passed on to the peers within the template.
Martian addresses
Martian addresses are invalid networks on the Internet.
Martian addresses are special IPv4 and IPv6 addresses which are not routed by routing devices on the Internet. OS10 considers
the following as Martian prefixes:
● 0.0.0.0/8
● 127.0.0.0/8
● 224.0.0.0/4
● :: / 128
● FF00::/8
FE80::/16
● ::0002-::FFFF- all prefixes
Route reflectors
Route reflectors (RRs) reorganize the IBGP core into a hierarchy and allow route advertisement rules. Route reflection divides
IBGP peers into two groups — client peers and nonclient peers.
● If a route is received from a nonclient peer, it reflects the route to all client peers
● If a route is received from a client peer, it reflects the route to all nonclient and client peers
An RR and its client peers form a route reflection cluster. BGP speakers announce only the best route for a given prefix. RR
rules apply after the router makes its best path decision.
NOTE: Do not use RRs in forwarding paths — hierarchal RRs that maintain forwarding plane RRs could create route loops.
Routers B, C, D, E, and G are members of the same AS—AS100. These routers are also in the same route reflection cluster,
where Router D is the route reflector. Routers E and G are client peers of Router D, and Routers B and C and nonclient peers of
Router D.
1. Router B receives an advertisement from Router A through EBGP. Because the route is learned through EBGP, Router B
advertises it to all its IBGP peers — Routers C and D.
2. Router C receives the advertisement but does not advertise it to any peer because its only other peer is Router D (an IBGP
peer) and Router D has already learned it through IBGP from Router B.
3. Router D does not advertise the route to Router C because Router C is a nonclient peer. The route advertisement came
from Router B which is also a nonclient peer.
4. Router D does reflect the advertisement to Routers E and G because they are client peers of Router D.
5. Routers E and G advertise this IBGP learned route to their EBGP peers — Routers F and H.
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