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IS-IS Support for Unidirectional Links draft-ietf-isis-udl-01.txt. Les Ginsberg ( ginsberg@cisco.com ) Sina Mirtorabi(smirtora@cisco.com) Stefano Previdi (sprevidi@cisco.com) Abhay Roy ( akr@cisco.com ). V1 Changes. Only covering changes since WG V0 - more details at:

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is is support for unidirectional links draft ietf isis udl 01 txt

IS-IS Support for Unidirectional Linksdraft-ietf-isis-udl-01.txt

Les Ginsberg (ginsberg@cisco.com)

Sina Mirtorabi(smirtora@cisco.com)

Stefano Previdi (sprevidi@cisco.com)

Abhay Roy(akr@cisco.com)

88th IETF, Vancouver, November 2013

v1 changes
V1 Changes

Only covering changes since WG V0 - more details at:

http://tools.ietf.org/html?draft=draft-ginsberg-isis-udl-00.txt

Additional UDL sub-TLVs:

Protocols Supported

IP Address

IPv6 Interface Address

IPv6 Global Address

MT

Clarify BFD and GR Support

88th IETF, Vancouver, November 2013

goals
Goals

Modest Protocol Extensions

No IP Encapsulation

No Static Configuration of neighbor Information

Allow UDL on the Return Path

Reliable Adjacency Maintenance

Reliable LSP Updates

Minimum Additional Network Wide Protocol Traffic

Support for Pt-Pt and LAN subnetworks

88th IETF, Vancouver, November 2013

basic mechanisms
Basic Mechanisms

Sending Hellos

IS-T sends hellos as normal

IS-R sends hello information in “UDL-LSPs”

Adjacency Maintenance

IS-T relies on existence of return path rooted at IS-R to IS-T

IS-R maintains as normal

Update Process

IS-T operates as DIS on LAN (even on Pt-Pt links)

IS-R operates as non-DIS on LAN (even on Pt-Pt links)

IS-R may use UDL-LSPs to send PSNP equivalent

Special rules for UDL-LSPs

88th IETF, Vancouver, November 2013

protocols supported sub tlv
Protocols Supportedsub-TLV

Sub-TLV Format

# octets

+---------------------------+

| Type (129) | 1

| (To be assigned by IANA) |

+---------------------------+

| Length | Number of NLPIDs

+---------------------------+

: NLPIDs :1 octet/NLPID

+---------------------------+

Specifies the set of Network Layer Protocol Identifiers that the originationing system is capable of forwarding (RFC 1195)

88th IETF, Vancouver, November 2013

ip address sub tlv
IP Addresssub-TLV

Sub-TLV Format

# octets

+---------------------------+

| Type (132) | 1

| (To be assigned by IANA) |

+---------------------------+

| Length | 4 * # of addresses

+---------------------------+

: IP Address(es) : 4 octets/address

+---------------------------+

Specifies the set of IP Addresses configured on the interface (RFC 1195)

88th IETF, Vancouver, November 2013

ipv6 interface address sub tlv
IPv6 Interface Addresssub-TLV

Sub-TLV Format

# octets

+---------------------------+

| Type (232) | 1

| (To be assigned by IANA) |

+---------------------------+

| Length | 16 * # of addresses

+---------------------------+

: IPv6 Address(es) :16 octets/address

+---------------------------+

Specifies the set of IPv6 Addresses configured on the interface (RFC 5308). Link local addresses.

88th IETF, Vancouver, November 2013

ipv6 global interface address sub tlv
IPv6 Global Interface Addresssub-TLV

Sub-TLV Format

# octets

+---------------------------+

| Type (233) | 1

| (To be assigned by IANA) |

+---------------------------+

| Length | 16 * # of addresses

+---------------------------+

: IPv6 Address(es) :16 octets/address

+---------------------------+

Specifies the set of global IPv6 Addresses configured on the interface (RFC 6119). Addresses are global or unique local.

88th IETF, Vancouver, November 2013

multi topology sub tlv
Multi-Topology sub-TLV

Sub-TLV Format

# octets

+---------------------------+

| Type (229) | 1

| (To be assigned by IANA) |

+---------------------------+

| Length | 2 * # of MTIDs

+---------------------------+

: MTID(s) | 2 octets/MTID

+---------------------------+

Specifies the set of topology identifiers supported as per (RFC 5120).

88th IETF, Vancouver, November 2013

bfd support w udl in return path

R

T

B

BFD Support w UDL in return path
  • Multihop BFD Required
  • When using RFC6213 BFD must come up before IS-IS adjacency comes up.
  • If UDL link on the return path then circular dependency if both T-R and B-T try to come up at the same time.
  • RFC 6213 NOT supported on UDL links

86th IETF, Orlando, March 2013

graceful restart support rfc 5306
Graceful Restart Support (RFC 5306)

IS-R Restarting

As hello information is sent in LSPs by IS-R this would require IS-R to generate new versions of UDL-LSPs prior to LSPDB sync

IS-T Restarting

IS-R is required to send CSNPs to IS-T. This is not supported and would many UDL-LSPs to be flooded in support of GR.

No Support for RFC 5306 on UDL Links

88th IETF, Vancouver, November 2013

slide12
QUESTIONS?

88th IETF, Vancouver, November 2013