Installation & Operation Manual
192
Document # LTRT-92224
Mediant 8000
Note:
It is imperative that you configure the aggregated link distribution rules that
match the specific details of the network, where the Mediant 8000 is installed and
that ensures that traffic is actually distributed across links. When in doubt, use the
recommended settings –
Source IP
– as described below.
Improperly configured distribution rules may lead to all traffic being transmitted via
the same single link, leaving other links in the aggregation group unused. This
essentially degrades the capacity of the Aggregated Links Group to a single link,
which defeats the purpose of the link aggregation.
Aggregated link distribution rules must be configured both on the Mediant 8000 (for
outgoing traffic) and on the next-hop network element – Layer 3 switch to which the
Mediant 8000 is connected (for incoming traffic). Configuration on the next-hop
network element – Layer 3 switch – must be "the opposite of" the Mediant 8000
configuration. For example, if the Mediant 8000 is configured to distribute traffic using
the
Source IP
address, the next-hop network element – Layer 3 switch – should be
configured to distribute the traffic according to the
Destination IP
address.
The following distribution rules are supported:
Source MAC
– packets are distributed based on the last three bits of the Source
MAC address; this rule is not recommended for use, since source MAC
addresses (of Media Gateway boards) may not be controlled by the user and may
not be evenly distributed.
Destination MAC –
packets are distributed based on the last three bits of the
Destination MAC address; this rule is not recommended for use, since usually the
next network element (hop) is a router which is represented by a single MAC
address. In such cases, all traffic will be routed via a single link.
Source XOR Destination MAC –
packets are distributed based on the last three
bits of the Source MAC address XOR'ed with the last three bits of the Destination
MAC address; this rule is not recommended for use for the same reasons, the
Source MAC
and
Destination MAC
rules are not recommended for use.
Source IP –
packets are distributed based on the last three bits of the Source IP
address; this is the recommended distribution policy, assuming that the IP
addresses of the Media Gateway boards are allocated consecutively.
Note:
Allocate IP addresses for the Media Gateway boards sequentially – e.g.
10.7.1.9, 10.7.1.10, 10.7.1.11 etc. – to ensure optimal traffic distribution across the
aggregated links when
Source IP
distribution policy is configured. Do not use any
"pattern" in IP addresses allocation. For example, the use of odd IP addresses only
– 10.7.1.3, 10.7.1.5 and 10.7.1.7 – will cause an uneven distribution of traffic
across the aggregated links. Don't forget to configure "the opposite" distribution
policy – based on the
Destination IP
– on the next-hop network element – Layer 3
switch to which the Mediant 8000 is connected.
Содержание Mediant 8000
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Страница 879: ...Part VIII Appendices This part describes additional Mediant 8000 configuration procedures...
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