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Zhenbin Li, Nan Wu IETF 85, Atlanta, GA, USA

Routing Extension for Fast-Reroute Using Maximally Redundant Trees draft-li-rtgwg-igp-ext-mrt-frr-00. Zhenbin Li, Nan Wu IETF 85, Atlanta, GA, USA. Background Introduction.

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Zhenbin Li, Nan Wu IETF 85, Atlanta, GA, USA

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  1. Routing Extension for Fast-Reroute Using Maximally Redundant Trees draft-li-rtgwg-igp-ext-mrt-frr-00 Zhenbin Li, Nan Wu IETF 85, Atlanta, GA, USA

  2. Background Introduction • [I-D.ietf-rtgwg-mrt-frr-architecture] describes the architecture based on Maximally Redundant Trees (MRT) to provide 100% coverage for FRR. Protocol extensions and considerations has been proposed. • The draft defines the detailed IGP extensions and procedures to support MRT FRR.

  3. IS-IS MRT-FRR Sub-TLV (1) • IS-IS MRT-FRR sub-TLV: It is an optional sub-TLV which can be advertised in the router capability TLV([RFC4971]) . The information has only level-wide scope. • Primary MT ID: Introduced to support multi-instance for MRT FRR. No. of Octets +--------------------------------+ |R |R |R |R | Primary MT ID | 2 +--------------------------------+ |R |R |R |R | Blue MRT MT ID | 2 +--------------------------------+ |R |R |R |R | Red MRT MT ID | 2 +--------------------------------+ | MRT Capabilities Available | 2 +----------------+---------------+ |MRT Algorithm ID| 1 +----------------+ |MRT Fd Mechanism| 1 +----------------+---------------+ | GADAG Root Election Priority | 2 +--------------------------------+

  4. IS-IS MRT-FRR Sub-TLV (2) • MRT Capabilities Available: A bitmap to specify the set of MRT capabilities that the router can support. +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ |0|1|2|3|4|5|6|*| Reserved | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ Bit0 - MRT-BIT Bit1 - IP-BIT Bit2 - LDP-BIT Bit3 - PIM-BIT Bit4 - PIMG-BIT Bit5 - mLDP-BIT Bit6 - mLDPG-BIT

  5. IS-IS MRT-FRR Sub-TLV (3) • MRT Algorithm ID: Specify the particular MRT algorithm used by the router. +-+-+-+-+-+-+-+-+ |0|1|*|*|*|*|*|*| +-+-+-+-+-+-+-+-+ Bit0 - LP-BIT Bit1 - SPF-BIT

  6. IS-IS MRT-FRR Sub-TLV (4) • MRT Forward Mechanism: Specify forwarding mechanisms the router supports. • Option A - LDP Destination-Topology Label: Use a label that indicates both destination and MRT. • Option B - LDP Topology Label: Use a Topology-Identifier label on top of the IP packet. • Red MRT Loopback Address and Blue MRT Loopback Address: If IP-in-IPv4 or IP-in-IPv6 are used as forwardingmechanisms for IP, they should be advertised by the Multi-Topology Reachable IPv4/IPv6 Prefixes TLV ([RFC5120]). +-+-+-+-+-+-+-+-+ |0|*|2|3|4|*|*|*| +-+-+-+-+-+-+-+-+ Bit0: LDP Destination-Topology Label Bit2: IP-in-IPv4 Bit3: IP-in-IPv6 Bit4: Encode MT-ID in Labels

  7. OSPF MRT-FRR TLV • OSPF MRT-FRR TLV: It is an optional TLV which can be advertised in the OSPF router information LSA([RFC4970]). The information has only area-wide scope. 0 1 2 3 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | Pri MT ID | Blue MRT MT ID| Red MRT MT ID | Reserved | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | MRT Capabilities Available | MRT Algr ID | MRT FdMecha | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | GADAG Root Election Priority | Reserved | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+

  8. Next Steps • Get feedback on IGP extensions and procedures(on mailing list) • Split the draft into two drafts ( ISIS and OSPF ) ?

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