IS-IS - Revision history

Heth: /* Default Metric */

2011-09-27T05:03:20Z

‎Default Metric

Heth at 03:53, 7 June 2011

2011-06-07T03:53:14Z

Heth: /* Links */

2010-12-14T14:30:20Z

‎Links

Heth: /* Links */

2010-12-14T14:30:02Z

‎Links

Heth: /* Links */

2010-12-14T10:33:09Z

‎Links

Heth: /* Example */

2010-08-17T08:40:02Z

‎Example

Heth: /* Links */

2010-04-29T06:43:32Z

‎Links

Heth at 06:43, 29 April 2010

2010-04-29T06:43:10Z

Heth: /* Configuration */

2010-03-12T11:48:35Z

‎Configuration

Heth: /* Example */

2009-04-26T05:38:16Z

‎Example

@@ Line 76: / Line 76: @@
 ==Default Metric==
-While some routing protocols calculate the link metric automatically based on bandwidth (OSPF) or bandwidth/delay (Enhanced Interior Gateway Routing Protocol [EIGRP]), there is no automatic calculation for IS-IS. Using old-style metrics, an interface cost is between 1 and 63 (6 bit metric value). All links use the metric of 10 by default. The total cost to a destination is the sum of the costs on all outgoing interfaces along a particular path from the source to the destination, and the least-cost paths are preferred.
+While some routing protocols calculate the link metric automatically based on bandwidth (OSPF) or bandwidth/delay (Enhanced Interior Gateway Routing Protocol [[EIGRP]]), there is no automatic calculation for IS-IS. Using old-style metrics, an interface cost is between 1 and 63 (6 bit metric value). All links use the metric of 10 by default. The total cost to a destination is the sum of the costs on all outgoing interfaces along a particular path from the source to the destination, and the least-cost paths are preferred.
 The total path metric was limited to 1023 (the sum of all link metrics along a path between the calculating router and any other node or prefix). This small metric value proved insufficient for large networks and provided too little granularity for new features such as Traffic Engineering and other applications, especially with high bandwidth links. Wide metrics are also required if route-leaking is used.

← Older revision		Revision as of 03:53, 7 June 2011
Line 1:		Line 1:
		+	For IS-IS to IPv6 see [[IS-IS IPv6]]
	= Intermediate-System to Intermediate-System =		= Intermediate-System to Intermediate-System =
	IS-IS is a link state Routing protocol which are also used in IP network. Here it is called integrated IS-IS. IS-IS is often used by providers as an [[IGP]].		IS-IS is a link state Routing protocol which are also used in IP network. Here it is called integrated IS-IS. IS-IS is often used by providers as an [[IGP]].

@@ Line 89: / Line 89: @@
 =Links=
 *[http://www.cisco.com/en/US/products/ps6553/products_white_paper09186a00801e199f.shtml IPv6 Multi-Topology IS-IS]
 *[http://www.cisco.com/en/US/docs/ios/iproute_isis/configuration/guide/irs_fscpc_ps6350_TSD_Products_Configuration_Guide_Chapter.html#wp1055209 Reducing Alternate-Path Calculation Times in IS-IS Networks]
 {{source cli}}
 [[Category:Cisco]][[Category:CCNP1]][[Category:CCNP]][[Category:IOS]][[Category:Network]]

@@ Line 88: / Line 88: @@
 =Links=
-*[http://www.cisco.com/en/US/docs/ios/iproute_isis/configuration/guide/irs_fscpc_ps6350_TSD_Products_Configuration_Guide_Chapter.html#wp1055209 Reducing Alternate-Path Calculation Times in IS-IS Networks]
+*[http://www.cisco.com/en/US/products/ps6553/products_white_paper09186a00801e199f.shtml IPv6 Multi-Topology IS-IS]
 {{source cli}}
 [[Category:Cisco]][[Category:CCNP1]][[Category:CCNP]][[Category:IOS]][[Category:Network]]

@@ Line 68: / Line 68: @@
    <cr>
 </source>
 =Links=
 *[http://www.cisco.com/en/US/docs/ios/iproute_isis/configuration/guide/irs_fscpc_ps6350_TSD_Products_Configuration_Guide_Chapter.html#wp1055209 Reducing Alternate-Path Calculation Times in IS-IS Networks]
 {{source cli}}
 [[Category:Cisco]][[Category:CCNP1]][[Category:CCNP]][[Category:IOS]][[Category:Network]]

@@ Line 20: / Line 20: @@
 = Configuration =
 == Example ==
-<pre>
+<source lang=cli>
 interface Loopback0
   ip address 192.168.100.12 255.255.255.255
@@ Line 33: / Line 33: @@
   is-type level-2-only
   metric-style wide
-</pre>
+</source>
 =ISIS and default-information =
 ISIS level 2 default announce 0.0.0.0 regardless of the network appears in the Routing table. To avoid this use a Route-map