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Topology Discovery Requirements

Topology Discovery Requirements. Loren Larsen World Wide Packets. Scope. Media supported Support all 802 media types. Basic Requirements. Device Discovery IP Address Device type, model, software release Topology Discovery Device MAC Address Remote Port Id

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Topology Discovery Requirements

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  1. Topology Discovery Requirements Loren Larsen World Wide Packets

  2. Scope • Media supported • Support all 802 media types

  3. Basic Requirements • Device Discovery • IP Address • Device type, model, software release • Topology Discovery • Device MAC Address • Remote Port Id • Handle Link Agg/PHY Redundancy • VLAN Discovery • Independent of Link Aggregation or xSTP

  4. Device Discovery • Current methods for IP Management Address Discovery • Notifications (traps) from DHCP Server (requires DHCP Server hooks) • NMS Pings an IP subnet range (extremely inefficient) • Rely on traps to NMS from device (unreliable) • NMS probes to router ARP caches and bridge tables for MAC discovery • Once IP Management discovered, type/version/SR Release can be retrieved (no standard MIBs for this)

  5. Topology Discovery • Current Methods • Use 802.3ad LACP MIB to identify device MAC of all neighboring devices (good approach, standards based, doesn’t help with other requirements) – assuming point-to-point links • Link Aggregation • 802.3ad LACP MIB can be used to identify aggregation groups.

  6. Topology Discovery 2 • PHY Redundancy • Solution must detect both physical connections • Protocol packet could report portId that is its physical backup

  7. VLAN Discovery • It’s desirable to allow the VLAN topology. • Port-based VLANs at a minimum • Other VLAN types would be a nice bonus, but probably much more complex.

  8. Protocol • Protocol should exchange information about its neighbors • Device stores information about the neighbor on each port • Neighbor information should age if not refreshed • Topology information can be retrieved from each device via SNMP

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