D-Link xStack DGS-3620 Series Reference Manual page 303

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xStack DGS-3620 Series Layer 3 Managed Stackable Gigabit Switch Web UI Reference Guide
Always compare MED
Deterministic MED
Best Path Option
Best Path Option State
Default Local
Preference
(0-4294967295)
Router Identifier
Hold Time (0-65535)
Keepalive Time
(0-65535)
Scan Timer (5-60)
Fast External Fallover
Aggregate Next Hop
Check
Enable or disable the comparison of the Multi Exit Discriminator (MED) for paths from
the neighbors in different Autonomous Systems. By default this setting is Disabled.
Enable or disable to enforce the deterministic comparison of the Multi Exit
Discriminator (MED) for paths received from the neighbors within the same
Autonomous System. By default this setting is Disabled.
Choose from AS Path Ignore, Compare Router ID, Med Confed, MED Missing As
Worst, and Compare Confed Aspath.
AS Path Ignore – If selected, the BGP process will ignore the AS path in the path
selection process.
Compare Router ID – If selected, the BGP process will include the router ID in the
path selection process. Similar routes are compared and the route with the lowest
router ID is selected.
Med Confed – If selected, the BGP process will compare the MED for the routes that
are received from confederation peers. For routes that have an external AS in the
path, the comparison does not occur.
MED Missing As Worst – If selecteded, the BGP process will assign a value of infinity
to routes that are missing the Multi Exit Discriminator (MED) attribute. If disabled, the
BGP process will assign a value of zero to routes that are missing the Multi Exit
Discriminator (MED) attribute, causing this route to be chosen as the best path.
Compare Confed Aspath - If selected, the BGP process will compare the
confederation AS path length of the routes received. The shorter the confederation
AS path length, the better the route is.
Used the drop-down menu to enable or disable AS Path Ignore, Compare Router ID,
Med Confed, MED Missing As Worst, and Compare Confed Aspath. The default is
Disabled.
Enter a default local preference between 0 and 4294967295. The default value is
100.
This field is used to set BGP router ID. An ID to identify a BGP router. If it is set to
zero the router ID will be automatically determined. User must specify a unique router
ID within the network.
The valid values are from 0 to 65535. The system will declare a peer as dead if a
keepalive message is received that is more than the hold time. The default value is
180 seconds. If the holdtime is set to zero, then the holdtime will never expire. If the
two routers that build a BGP connection have a different hold time, then the smaller
hold time will be used. If the timer is specified for specific neighbors, then the
neighbor specific timer will take effect. The hold time needs to be at least three times
that of the keepalive timer.
The valid values are from 0 to 65535. This specifies the interval at which keepalive
messages are sent to its peer. If the keepalive value is set to zero, then the keepalive
message will not be sent out. The default value is 60 seconds. If the two routers that
build a BGP connection have a different keepalive timer, then the smaller keepalive
timer will be used. If the timer is specified for specific neighbors, then the neighbor
specific timer will take effect.
Enter the BGP scan timer value from 5 to 60 seconds or tick the Default check box.
The default value is 60 seconds.
Enable or disable fast external fallover. This configures a Border Gateway Protocol
(BGP) routing process to immediately reset its external BGP peer sessions if the link
used to reach these peers goes down. The default state is Enabled.
Enable or disable aggregate next hop check. This is used to configure the BGP
aggregated routes' next hop check. Only the routes with the same next hop attribute
can be aggregated if the BGP aggregate next hop check is Enabled. The default
state is Disabled.
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