CCIE notes

CCIE notes

Route-distinguisher format

PAGP (Cisco proprietary) - auto/desirable, desirable/desirable and on/on

LACP (IEEE) - passive/ active, active/active, on/on


On = switchport mode trunk

Desirable = switchport mode dynamice desirable

Auto = switchport mode dynamic auto

Nonegotiate = switchport mode nonegotiate

Off = no switchport mode trunk or switchport mode access

BGP route selection criteria
Select a path with a reachable next hop. - N
Select the path with the highest weight. - W
If path weights are the same, select the path with the highest local preference value. - P
Prefer locally originated routes (network routes, redistributed routes, or aggregated routes) over received routes. - L
Select the route with the shortest AS-path length. -A
If all paths have the same AS-path length, select the path based on origin: IGP is preferred over EGP; EGP is preferred over Incomplete. -O
If the origins are the same, select the path with lowest MED value. -M
If the paths have the same MED values, select the path learned via EBGP over one learned via IBGP. - T
Select the route with the lowest IGP cost to the next hop. -I
Select the route received from the peer with the lowest BGP router ID. –P

BGP Default Communities
internet - Advertise this route to the Internet community. All routers belong to it.
no-export - Do not advertise this route to eBGP peers (real BGP peers).
no-advertise - Do not advertise this route to any peer (internal or external).
local-as - Do not advertise this route to peers outside the local autonomous system. This route will not be advertised to other autonomous systems or sub-autonomous systems when confederations are configured.

N—a change in a network LSA (type 2) has occurred.
R—a change in a router LSA (type 1) has occurred.
SN—a change in a Summary Network (SN) LSA has occurred.
SA—a change in a...

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