ISIS Cisco live

ISIS Cisco live
English | Size: 467.37 MB
Category: Cisco | Networking

ISIS Deployment in Modern
Networks
BRKRST-2338
Mani Ganesan – CCIE R&S / SP #27200
Routing Protocols TAC
@mani_cisco
Donnie Savage – Routing TME
BRKRST-2338 © 2014 Cisco and/or its affiliates. All rights reserved. Cisco Public
Agenda
• ISIS Overview
– CLNS, L1/L2 Routing, Best Practices
• ISIS for IPv6
– Single Topology, Multi-Topology
• ISIS in the Backbone
– Fast Convergence Features
• ISIS at the Edge
– BGP and MPLS Considerations
• ISIS at the Access / Aggregation
– Route Leaking, Traffic Engineering and IP FRR
Reference only slide
3
BRKRST-2338 © 2014 Cisco and/or its affiliates. All rights reserved. Cisco Public
What is IS-IS ?
• IS-IS is a link-state routing protocol;
– Commonly used in Service Providers and large Enterprise networks.
– Offer Fast convergence
– Excellent scalability
– Flexibility in terms of tuning
• Easily extensible with Type/Length/Value (TLV) extensions;
– IPv6 Address Family support (RFC 2308)
– Multi-Topology support (RFC 5120)
– MPLS Traffic Engineering (RFC 3316)
Intermediate System-to-Intermediate System (IS-IS) Overview
4
BRKRST-2338 © 2014 Cisco and/or its affiliates. All rights reserved. Cisco Public
What is IS-IS ?
• 1985: Originally called DECnet Phase V Routing
• 1988: Adopted by ISO and renamed IS-IS
• 1990: Publication of RFC 1142 (OSI IS-IS Intradomain Routing Protocol)
• 1990: Publication of RFC 1195 (Use of OSI IS-IS for Routing in TCP/IP and Dual
Environments)
• 1991: Cisco IOS Software starts supporting IS-IS
• 1995: ISPs start adopting IS-IS
• 2000: Publication of IETF draft “IS-IS Extensions for Traffic Engineering”
• 2001: Publication of IETF draft “IS-IS Extensions in Support of Generalized MPLS”
• 2008: RFC 5308 adds IPv6 support (RFC 5120 adds Multi-Topology Routing support)
A Condensed History of IS-IS
5
BRKRST-2338 © 2014 Cisco and/or its affiliates. All rights reserved. Cisco Public
• IS-IS is a Layer 2 protocol and is not encapsulated in IP
• IS-IS Protocol Data Unit (PDU) uses CLNS Ethertype 0x8872
• Logical Link Control (LLC) Data-link header uses :
– DSAP (Destination Service Access Point) set to 0xFE
– SSAP (Source Service Access Point) set to 0xFE
• IS-IS Fixed header
• IS-IS Data encoded as Type-Length-Value (TLV)

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