Limitations and Compatible Characteristics of Ethernet Link Bundles
This list describes the properties and limitations of ethernet link bundles:
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Starting with Cisco IOS XR Release 7.2.1, the router supports mixed speed bundles, allowing member links with different bandwidths to be included in the same bundle. The traffic distribution across bundle members is based on the bandwidth of each link. Mixed speed bundles are subject to a maximum bandwidth ratio of 10:1 between the fastest and slowest member links.
For example, you can combine a 10 Gbps and a 100 Gbps link or a 100 Gbps and a 40 0Gbps link in the same bundle; however, a 10 Gbps and a 400 Gbps link cannot be bundled together. Load balancing is performed in proportion to the bandwidth of each member link. Typical valid combinations include:
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400G, 100G
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400G, 40G
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400G, 100G, 40G
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100G, 40G
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100G, 10G
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100G, 40G, 10G
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40G and 10G
Additionally, the total weight of the bundle must not exceed 64.
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The weight of each bundle member is the ratio of its bandwidth to the lowest bandwidth member. Total weight of the bundle is the sum of weights or relative bandwidth of each bundle member. Since the weight for a bundle member is greater than or equal to 1 and less than or equal to 10, the total member of links in a bundle is less than 64 in mixed bundle case.
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Any type of Ethernet interfaces can be bundled, with or without the use of Link Aggregation Control Protocol (LACP).
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With Cisco IOS XR Release 7.3.15, a single router can support up to 1023 bundle interfaces, with each bundle accommodating up to 64 member links.
If adding a new line card causes these limits to be exceeded, the system will experience continuous Out of Resource (OOR) failures. To resolve these errors, you must either reduce the scale or disable the affected line card.
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Physical layer and link layer configuration are performed on individual member links of a bundle.
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Configuration of network layer protocols and higher layer applications is performed on the bundle itself.
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IPv4 and IPv6 addressing is supported on ethernet link bundles.
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A bundle can be administratively enabled or disabled.
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Each individual link within a bundle can be administratively enabled or disabled.
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Ethernet link bundles are created in the same way as Ethernet channels, where the user enters the same configuration on both end systems.
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The MAC address that is set on the bundle becomes the MAC address of the links within that bundle.
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Load balancing (the distribution of data between member links) is done by flow instead of by packet. Data is distributed to a link in proportion to the bandwidth of the link in relation to its bundle.
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QoS is supported and is applied proportionally on each bundle member.
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All links within a single bundle must terminate on the same two systems.
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Bundled interfaces are point-to-point.
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A link must be in the up state before it can be in distributing state in a bundle.
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Only physical links can be bundle members.