ccie_rs_quick_review_kit_ver2

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long-term measurements. Max is in packets per million
If OER does not find an in-policy exit when in good mode, OER transitions the traffic class
entry to an uncontrolled state. If best mode is used, then the best OOP exit is used. Packet Loss loss {relative | threshold }
set loss {relative | threshold }
Jitter set jitter threshold
Used to adjust the transition period that the MC holds an out-of-policy traffic class entry.
MC waits for the transition period before making an attempt to find an in-policy exit
set mos {threshold percent }
OER/PfR
MOS MOS threshold are recorded in a five-minute period
backoff []
set backoff []
Policy
Timers are in seconds. Define minimum transition period, maximum time OER holds an
Backoff
out-of-policy traffic class entry when there are no links that meet the policy requirements of Policies may conflict, one exit point may provide best delay while the other has lowest link utilization
the traffic class entry. The step argument allows you to optionally configure OER to add
Policy with the lowest value is selected as the highest priority policy
time each time the minimum timer expires until the maximum time limit has been reached
By default OER assigns the highest priority to delay policies, then to utilization policies
Used to configure the traffic class entry route dampening timer to set the minimum
Variance configures the acceptable range (%) between the metrics measured for
period of time that a new exit must be used before an alternate exit can be selected
Priority
different exits that allows treating the different exits as equivalent with respect to a
Holddown Resolution particular policy (acceptable deviation from the best metric among all network exits)
holddown
OER does not implement route changes while a traffic class entry is in the holddown state Timers
resolve {cost priority | delay priority variance | loss priority
variance | range priority | utilization priority variance }
periodic
Policy with the highest priority will be selected to determine the policy decision. Priority 1 is
set periodic
highest, 10 is lowest. Each policy must be assigned a different priority number
The mode select-exit command is used to determine if OER selects
Periodic
the first in-policy exit or the best available exit when this timer expires
set resolve {cost priority | delay priority variance | loss priority
variance | range priority | utilization priority variance }
oer master
mode route control
OER, by default, operates in an observation mode. Enable route control
mode. In control mode MC implements changes based on policy parameters
BGP can inject route or modify local preference
set mode route control
All BGP injected routes have no-export community added so they do not leak outside AS
MC expects Netflow update for a traffic class from the new link interface and ignores Enable
oer master
Netflow updates from the previous path. If Netflow update does not appear after 120
BGP
mode route metric bgp local-pref
sec, the MC moves traffic class into default state (it is then not under OER control)
control Default preference is 5000
After OER selects the best entrance for inside prefix, BGP prepend
Injected static routes exist only in the memory of the router
community is attached to the inside prefix advertisements from the
Split prefix is a more specific route which will be preferred over a less specific route other entrances that are not the OER-preferred entrances
Static
oer master oer master
Route
mode route metric static border
Injection OER/PfR
Entrance Link
Default TAG is 5000 interface external
router Selection
maximum utilization receive {absolute | percent }
Traffic Control
redistribute static [route-map ]
Sets max inbound (receive) traffic utilization for the configured OER-managed link interface
If an IGP is used and no iBGP is configured, static route redistribution
downgrade bgp community
must be configured on border routers. Route map can be used to
downgrade options for BGP advertisement for the configured OER-managed
match the tag of 5000 to redistribute only OER-sourced prefixes.
entrance link interface. Community will be added to the BGP advertisement
show route-map dynamic
If iBGP peering is enabled on the border routers, the master controller
show ip access-list dynamic will inject iBGP routes into routing tables on the border routers
debug oer border routes {bgp | static | piro [detail]} Verify
IP address for each eBGP peering session must be reachable from the border router
show oer master traffic-class iBGP via a connected route. Since 12.4(9)T neighbor ebgp-multihop is supported
OER applies a local preference value of 5000 to injected routes by default
show oer master prefix [detail | learned [delay | throughput] |
[detail | policy | traceroute [ | | current] [now]]] No-export community is automatically applied to injected routes
Page 28 of 40
By Krzysztof Zaleski, CCIE #24081. This Booklet is available for free and can be freely distributed in a form as is. Selling is prohibited.
Initial - not enabled yet, interface activated
Cisco proprietary. UDP/1985 Learn - virtual IP is not known yet, and has not seen messages from active router
(IF) standby version {1 | 2}
Listen - router knows virtual IP, but is neither active, nor standby
V2 has different frame format (TLV), incompatible with V1. Default is V1
Speak - actively participate in election (must have virtual IP configured)
Standby monitoring the active router, ready to take over
Hello multicasted to 224.0.0.2
Version 1 Active router acively responding to ARPs
Virtual MAC: 0000.0C07.ACxx, where xx group #. Up to 255 groups per interface
One Active router (with highest priority), one Standby router, remaining routers in a group are in
listen-state. Only Active and Standby routers generate messages. If standby router becomes
Hello multicasted to 224.0.0.102
active, other router (currently listening, and with highest priority) becomes standby router.
Version 2
Virtual MAC: 0000.0C9F.Fxxx, where xxx group #. Up to 4095 groups per
(IF) standby priority
interface, but platform-dependant, per-interface recommended limits still apply
Highest priority (0-255) wins (multicasted), default is 100
(IF) standby [] &
(IF) standby preempt [delay {minimum | reload }]
If group # is not defined, 0 is used
If local router has priority higher than the current active router, it should attempt to become
(IF) standby name
Features States active router. No preemprion by default. If enabled, default delay is 0 immediate.
The HSRP group name must be unique on the router. It is assigned automaticaly
(ex. Group name is "hsrp-Fa0/0-1), but can be defined to be more informative (IF) standby follow
HSRP group can become a redundancy client of another HSRP group. Client or slave groups
show standby [brief]
(G) standby redirects [{enable | disable}]
must be on the same physical interface as the master group. Recursive following is not possible
(IF) standby redirect [timers ]
(IF) standaby ip [secondary]
Real IP address of a router can be replaced with a virtual IP address in NH/GW field
Secondary IP addresses/subnets can also run HSRP. There can be many secondary
of the ICMP redirect packet. Default advertisement is 60 sec, holddown is 180 sec.
entries for the same group. Primary and secondary IPs can be used together.
(IF) no standby redirect unknown
Allows redirects only between routers configured for HSRP for particular group. If NH At least one router must have IP address in HSRP group. Other
is a router for which real IP to virtual IP mapping is not defined, redirect is not ent. routers can learn via hello (Virtual IP is sent within HSRP messages)
(IF) standby bfd
(G) standby bfd all-interfaces [ Pobierz całość w formacie PDF ]

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