Provided by isis_support@redback.com
for NANOG 20 "Introduction to IS-IS"
tutorial
An Example of Redback ISIS configuration
October 12, 2000
isis_support@redback.com
(1) Redback router IS-IS setup
Router "sunnyvale-c1" has 3 IS-IS interfaces and are connected
to IS-IS instances "Optical-Backbone" on fe1/1, to instance
"IP-Metro-SanJose" on sr2/1 and fe3/1. IS-IS Authentication is applied
to all IS-IS packets on instance "Optical-Backbone" with hmac-md5, and
authentication is applied only on IIH packets on instance
"IP-Metro-SanJose". IS-IS level-2 prefixes are leaked into level-1 with
the prefix-list policy on "Optical-Backbone". The IS-IS "Optical-Backbone"
prefixes are redistributed into instance "IP-Metro-SanJose" on level-1
with a route-map policy applied. IS-IS instance "IP-Metro-SanJose" is
running with "wide" metric style.
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(2) show IS-IS portion of the configuration
[local]sunnyvale-c1#show configuration isis
Current configuration:
context local
!
interface fe1/1
ip address 10.1.1.1/24
ip router isis Optical-Backbone
isis circuit type level-2-only
!
interface sr2/1
ip address 10.3.1.1/24
ip router isis IP-Metro-SanJose
isis circuit type level-1
isis authentication key-chain bar
!
interface fe3/1
ip address 10.7.1.1/16
ip router isis IP-Metro-SanJose
isis authentication key-chain foo type simple
!
router isis Optical-Backbone
net 47.0001.1111.1111.1111.00
interarea-distribute l2-to-l1 prefix-list filter-100/8
authentication key-chain foo
!
router isis IP-Metro-SanJose
net 49.0002.1111.1111.1111.00
redistribute isis Optical-Backbone level-1 route-map metro-sanjose
metric-style wide
[local]sunnyvale-c1#
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(3) show IS-IS interface information
[local]sunnyvale-c1#show isis interface
[local]sunnyvale-c1#show isis interfaces
IS-IS interface(s) for tag Optical-Backbone:
Interface L P State Level-1-DR Level-2-DR Metric
fe1/1 2 Up sunnyvale-c1.01 10
Total IS-IS Interface(s): 1
IS-IS interface(s) for tag IP-Metro-SanJose:
Interface L P State Level-1-DR Level-2-DR Metric
sr2/1 1 Up sunnyvale-c1.01 10
fe3/1 3 Up sunnyvale-c1.02 sunnyvale-c1.02 10
Total IS-IS Interface(s): 2
[local]sunnyvale-c1#
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(4) show IS-IS interface detail information
[local]sunnyvale-c1#sh isis interfaces detail
IS-IS interface(s) for tag Optical-Backbone:
fe1/1
Up, Ckt level: 2, lan, IP address: 10.1.1.1/24, Ckt id: 0x01
Level Adjs Priority Hello Hold Auth Blocked Metric
2 1 64 5 24 10
Total IS-IS Interface(s): 1
IS-IS interface(s) for tag IP-Metro-SanJose:
sr2/1
Up, Ckt level: 1, lan, IP address: 10.3.1.1/24, Ckt id: 0x02
Level Adjs Priority Hello Hold Auth Blocked Metric
1 1 64 9 24 md5 10
fe3/1
Up, Ckt level: 3, lan, IP address: 10.7.1.1/16, Ckt id: 0x03
Level Adjs Priority Hello Hold Auth Blocked Metric
1 1 64 4 24 simple 10
2 1 64 5 24 simple 10
Total IS-IS Interface(s): 2
[local]sunnyvale-c1#
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(5) show IS-IS adjacency information
[local]sunnyvale-c1#show isis adjacency
IS-IS Adjacenc(ies) for tag Optical-Backbone:
SystemId Interface Lvl State Holdtime SNPA Uptime
santa-cruz-b1 fe1/1 2 Up 22 00d0.b714.1512 01:18:33
Total IS-IS Adjacenc(ies): 1
IS-IS Adjacenc(ies) for tag IP-Metro-SanJose:
SystemId Interface Lvl State Holdtime SNPA Uptime
palo-alto-c2 sr2/1 1 Up 18 0090.27af.4269 00:06:15
4444.4444.4444 fe3/1 2 Up 22 0030.949f.cb00 00:06:16
4444.4444.4444 fe3/1 1 Up 22 0030.949f.cb00 00:06:19
Total IS-IS Adjacenc(ies): 3
[local]sunnyvale-c1#
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(6) show IS-IS redistributed or leaked prefixes
[local]sunnyvale-c1#sh isis routes redistribute
IS-IS Redistributed route(s) for tag Optical-Backbone, on Level-1
Prefix L Type Source Metric M-Type Summarized
100.0.0.0/24 1 Leak isis 15 Int
100.0.1.0/24 1 Leak isis 15 Int
100.0.2.0/24 1 Leak isis 15 Int
100.0.3.0/24 1 Leak isis 15 Int
100.0.4.0/24 1 Leak isis 15 Int
Total IS-IS Redistributed Route(s) in level-1 for tag Optical-Backbone: 5
IS-IS Redistributed route(s) for tag IP-Metro-SanJose, on Level-1
Prefix L Type Source Metric M-Type Summarized
100.0.0.0/24 1 Ext isis 20 Ext
Total IS-IS Redistributed Routes in level-1 for tag IP-Metro-SanJose: 1
IS-IS Redistributed route(s) for tag IP-Metro-SanJose, on Level-2
Prefix L Type Source Metric M-Type Summarized
10.3.1.0/24 2 Leak isis-intf 10 Int
10.7.0.0/16 2 Leak isis-intf 10 Int
Total IS-IS Redistributed Routes in level-2 for tag IP-Metro-SanJose: 2
[local]sunnyvale-c1#
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(7) show IS-IS route summary information
[local]sunnyvale-c1#show isis routes summary
IS-IS route(s) summary for tag Optical-Backbone:
Route Type Level-1 Level-2 Summarize(L1/L2) L2-to-L1 Leak
IS-IS Route 0 11 - 0
Redistribute 0 0 0/0
Inter-area 5 0 0/0
Summary Address 0 0 0/0
IS-IS interface routes: 1
Route leaking prefix lists: filter-100/8(l2-to-l1)
IS-IS route(s) summary for tag IP-Metro-SanJose:
Route Type Level-1 Level-2 Summarize(L1/L2) L2-to-L1 Leak
IS-IS Route 3 0 - 0
Redistribute 1 0 0/0
Inter-area 0 2 0/0
Summary Address 0 0 0/0
IS-IS interface routes: 2
Redistributed protocols: isis
[local]sunnyvale-c1#
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(8) show one IS-IS prefix
This prefix 100.0.3.0/24 is learn through level-2 with nexthop
of 10.1.1.2 on interface fe1/1. This route is from LSP 2222.2222.2222.00-00
of seq# 0x24 from router santa-cruz-b1. That lsp was last arrived 4:35 ago
from interface fe1/1.
[local]sunnyvale-c1#show isis route 100.0.3.0/24
IS-IS prefix for tag Optical-Backbone:
Prefix Level Metric Interface Nexthop
100.0.3.0/24 2 15 fe1/1 10.1.1.2
Is sourced from LSP(s):
LSP ID Seq # System Name Arrive(ago) Interface(from)
2222.2222.2222.00-00 0x24 santa-cruz-b1 00:04:35 fe1/1
[local]sunnyvale-c1#
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(9) some debug IS-IS information
This output captured the debug output on isis adjacency events for
both send and receive packets on interface fe1/1 with packet source systemID
of 2222.2222.2222:
[local]sunnyvale-c1#debug isis adjacency filter interface fe1/1 system-id ?
String System ID (XXXX.XXXX.XXXX)
[local]sunnyvale-c1#$adjacency filter interface fe1/1 system-id 2222.2222.2222
[local]sunnyvale-c1#
Oct 11 04:19:34: %ISIS-7-ADJ: rcvd L2 LAN IIH from 00d0.b714.1512 on intf fe1/1
Oct 11 04:19:36: %ISIS-7-ADJ: send L2 LAN IIH on intf fe1/1
Oct 11 04:19:42: %ISIS-7-ADJ: rcvd L2 LAN IIH from 00d0.b714.1512 on intf fe1/1
Oct 11 04:19:43: %ISIS-7-ADJ: send L2 LAN IIH on intf fe1/1
[local]sunnyvale-c1#no debug isis all
[local]sunnyvale-c1#