Filtering PIM-SM Bootstrap Messages

Problem

Your PIM-SM domain uses bootstrap routers to elect RPs. Some of the routers have interfaces that connect to other PIM-SM domains. You need to ensure that Bootstrap messages do not cross the domain boundary.

Solution

On router interfaces that connect to other PIM-SM domains, create filters to prevent bootstrap router messages from crossing domain boundaries:

	[edit policy-options]
	aviva@RouterB# set policy-statement pim-bootstrap-import from interface se-0/0/3
	aviva@RouterB# set policy-statement pim-bootstrap-import then reject
	aviva@RouterB# set policy-statement pim-bootstrap-export from interface se-0/0/3
	aviva@RouterB# set policy-statement pim-bootstrap-export then reject

	[edit protocols pim]
	aviva@RouterB#  
set rp bootstrap-import pim-bootstrap-import
	aviva@RouterB#  
set rp bootstrap-export pim-bootstrap-export

Discussion

As a final part of the bootstrap router configuration, you need to make sure that Bootstrap messages from one PIM-SM domain don accidentally cross into another PIM-SM domain. To prevent this from happening, configure bootstrap routing-policy filters that reject all incoming and outgoing traffic on interfaces that connect to other PIM-SM domains. The two policies you need to accomplish this are very simple:

	aviva@RouterB> show configuration policy-options
	policy-statement pim-bootstrap-import {
	 from interface se-0/0/3.0;
	 then reject;
	}
	policy-statement pim-bootstrap-export {
	 from interface se-0/0/3.0;
	 then reject;
	}

Apply these policies directly in the PIM bootstrap configuration, with the set rp bootstrap-import and set rp bootstrap-export commands in the [edit protocols pim] hierarchy.

See Also

Recipes 9.1 and 16.4


Router Configuration and File Management

Basic Router Security and Access Control

IPSec

SNMP

Logging

NTP

Router Interfaces

IP Routing

Routing Policy and Firewall Filters

RIP

IS-IS

OSPF

BGP

MPLS

VPNs

IP Multicast



JUNOS Cookbook
Junos Cookbook (Cookbooks (OReilly))
ISBN: 0596100140
EAN: 2147483647
Year: 2007
Pages: 290
Authors: Aviva Garrett

Similar book on Amazon

Flylib.com © 2008-2017.
If you may any questions please contact us: flylib@qtcs.net