User Manual

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NETGEAR M4500 Series Switches CLI Command Reference Manual 779
To be considered a match for an aggregate address, a prefix must be more specific (i.e. have a longer prefix
length) than the aggregate address. A prefix whose prefix lengh equals the length of the aggregate address is not
considered a match.
BGP accepts up to 128 summary addresses for each address family.
Format aggregate-address {<address> <mask> | <ipv6-prefix> <prefix-length>} [as-set] [summary-only]
no aggregate-address {<address> <mask> | <ipv6-prefix> <prefix-length>} [as-set] [summary-only]
Default None
Unless the options are specified, the aggregate is advertised with the ATOMIC_AGGREGATE attribute
and an empty AS path, and the more specific routes are advertised along with the aggregate.
Mode Router BGP Config Mode
IPv4 VRF Address Family
6.10.2.4. bgp aggregate-different-meds
Use bgp aggregate-different-meds command to allow aggregation of routes with different MED values. Use no
bgp aggregate-different-meds command to disable this function.
When this command is issued, the path for an active aggregate address is advertised without a MED attribute.
When this command is not issued, if multiple routes match an aggregate address, but have different MEDs, the
aggregate takes the MED of the first matching route. Any other matching prefix with the same MED is included
in the aggregate. Matching prefixes with different MEDs, are not considered to be part of the aggregate and
continue to be advertised as individual routes.
Format bgp aggregate-different-meds
no bgp aggregate-different-meds
Fields
Definition
Address
Summary IPv4 address. The default route cannot be configured as an aggregate
address.
Mask
Summary IPv4 mask. The mask cannot be a 32-bit mask (255.255.255.255). The
combination of address and mask must be a valid unicast destination prefix.
ipv6-prefix
Summary IPv6 prefix. Not support under IPv4 VRF address family mode.
prefix-length
Summary IPv6 prefix length. The range is from 1 to 127. Not support under IPv4
VRF address family mode.
as-set
if this option is set, the aggregate is advertised with a non-empty AS_PATH. If the
AS_PATH of all contained routes is the same, the AS_PATH of the aggregate is the
AS_PATH of the contained route. Otherwise, if the contained routes have
different AS_PATHs, the AS_PATH attribute includes an AS_SET with each of the
AS numbers listed in the AS_PATHs of the aggregate routes.
summary-only
Filters all more-specific routes within the aggregate address and not being
advertised to neighbors.