IS-IS.pdf

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IS-IS Ğ P ART 1
packetlife.net
Protocol Header
Attributes
4
8
12
16
Type
Link-State
IRPD
Packet Length
Algorithm
Dijkstra
Version/Protocol ID Extension
ID Length
Metric
Default (10)
R R R
PDU Type
Version
AD
115
Reserved
Maximum Area Addresses
Standard
ISO 10589
Type
Length
Protocols
IP, CLNS
Value ...
Transport
Layer 2
Authentication Plaintext, MD5
NSAP Addressing
Routing Levels
Interdomain Part
Domain-Specific Part
Level 0
Used to locate end systems
NSAP
AFI
IDI
HODSP
Level 1
Routing within an area
System ID
SEL
Condensed
Area
Level 2
Backbone between areas
Example
47
0005.80ff.f800.0000
0001
0000.0c00.1234
00
Level 3 Inter-AS routing
Interdomain Part (IDP)
Portion of the address used in routing between autonomous
systems; assigned by ISO
Terminology
Type-Length-Value (TLV)
Variable-length modular datasets
Link State PDU (LSP)
Carry TLVs encompassing link state
information
Domain-Specific Part (DSP)
Portion of the address relevant only within the local AS
Authority and Format Identifier (AFI)
Identifies the authority which dictates the format of the address
Sequence Number Packet (SNP)
Used to request and advertise LSPs; can
be complete (CSNP) or partial (PSNP)
Hello Packet
Establishes and maintains neighbor
adjacencies
Designated Intermediate System
A pseudonode responsible for emulating
point-to-point links across a multi-access
segment
Initial Domain Identifier (IDI)
An organization belonging to the AFI
High Order DSP (HODSP)
The area within the AS
System ID
Unique router identifier; 48 bits for Cisco devices (often taken from
a MAC address)
NSAP Selector (SEL)
Identifies a network layer service; always 0x00 in a NET address
Adjacency Requirements
Network Types
Ğ Interface MTUs must match
Broadcast
Point-to-Point
Ğ Levels must match
DIS Elected Yes
No
Ğ Areas must match (if level 1)
Neighbor Discovery Yes
Yes
Ğ System IDs must be unique
Hello/Dead Timers 10/30
10/30
Ğ Authentication must succeed
Troubleshooting
DIS Election
show ip route
show isis spf-log
Ğ Highest-priority interface elected
show ip protocols
debug isis spf-events
Ğ Highest SNPA (MAC/DLCI) breaks tie
show [clns|isis] neighbor
debug isis adjacencies-packets
Ğ Highest system ID breaks SNPA tie
show [clns|isis] interface
debug isis spf-statistics
Ğ Default interface priority is 64
show isis database
debug isis update-packets
Ğ Current DIS may be preempted
by Jeremy Stretch
v2.0
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IS-IS Ğ P ART 2
packetlife.net
TLV Types
Name
Use
Name
Use
Name
Use
1 Area Addresses
Hello, LSP
6 IS Neighbors
Hello, L2 LSP
128 IP Internal Reach.
LSP
2 IS Neighbors
LSP
8 Padding
Hello
129 Protocols Supported
Hello, LSP
3 ES Neighbors
L1 LSP
9 LSP Entries
SNP
131 IDRPI
SNP, L2 LSP
5 Prefix Neighbors L2 LSP
10 Authentication All
132 IP Interface Address Hello, LSP
Configuration Example
Area 1
192.168.1.0/24
Router A2
interface FastEthernet0/0
description Area 1
ip address 192.168.1.2 255.255.255.0
ip router isis
isis circuit-type level-1
A3
A2
!
router isis
net 49.0001.0000.0000.00a2.00
A1
Router B2
Area 3
192.168.3.0/24
Area 2
192.168.2.0/24
interface FastEthernet0/0
description Area 2
ip address 192.168.2.2 255.255.255.0
ip router isis
isis circuit-type level-1
B2
C2
!
router isis
net 49.0002.0000.0000.00b2.00
10.0.0.8/30
C1
B1
B3
C3
Router A1
Router B1
interface FastEthernet0/0
description Area 1
ip address 192.168.1.1 255.255.255.0
ip router isis
isis circuit-type level-1
interface FastEthernet0/0
description Area 2
ip address 192.168.2.1 255.255.255.0
ip router isis
isis circuit-type level-1
!
interface Serial1/0
no ip address
encapsulation frame-relay
!
interface Serial1/0
no ip address
encapsulation frame-relay
!
interface Serial1/0.1 point-to-point
description To Area 2
ip address 10.0.0.1 255.255.255.252
ip router isis
isis circuit-type level-2-only
! MD5 authentication (keychain not shown)
isis authentication mode md5
isis authentication key-chain <keychain>
frame-relay interface-dlci 101
!
interface Serial1/0.1 point-to-point
description To Area 1
ip address 10.0.0.2 255.255.255.252
ip router isis
isis circuit-type level-2-only
! MD5 authentication (keychain not shown)
isis authentication mode md5
isis authentication key-chain <keychain>
frame-relay interface-dlci 101
!
interface Serial1/0.2 point-to-point
description To Area 3
ip address 10.0.0.5 255.255.255.252
ip router isis
isis circuit-type level-2-only
frame-relay interface-dlci 102
!
interface Serial1/0.2 point-to-point
description To Area 3
ip address 10.0.0.9 255.255.255.252
ip router isis
isis circuit-type level-2-only
frame-relay interface-dlci 103
!
router isis
net 49.0001.0000.0000.00a1.00
!
router isis
net 49.0002.0000.0000.00b1.00
by Jeremy Stretch
v2.0
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