HP 6125G HP 6125G & 6125G/XG Blade Switches IP Multicast Configuration - Page 319
Disabling BSM semantic fragmentation
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Step Command 3. Configure the BS period. c-bsr interval interval 4. Configure the BS timeout timer. c-bsr holdtime interval Remarks Optional. By default, the BS period is determined by the formula "BS period = (BS timeout - 10) / 2." The default BS timeout is 130 seconds, so the default BS period = (130 - 10) / 2 = 60 (seconds). The BS period value must be smaller than the BS timeout value Optional. By default, the BS timeout value is determined by the formula "BS timeout timer = BS period × 2 + 10." The default BS period is 60 seconds, so the default BS timeout timer = 60 × 2 + 10 = 130 (seconds). NOTE: If yon configure the BS period or the BS timeout timer, the system uses the configured one instead of the default one. Disabling BSM semantic fragmentation Generally, a BSR periodically distributes the RP-set information in bootstrap messages within the IPv6 PIM-SM domain. It encapsulates a BSM in an IPv6 datagram and might split the datagram into fragments if the message exceeds the maximum transmission unit (MTU). In respect of such IP fragmentation, loss of a single IP fragment leads to unavailability of the entire message. Semantic fragmentation of BSMs can solve this issue. When a BSM exceeds the MTU, it is split to multiple bootstrap message fragments (BSMFs). • After receiving a BSMF that contains the RP-set information of one group range, a non-BSR router updates corresponding RP-set information directly. • If the RP-set information of one group range is carried in multiple BSMFs, a non-BSR router updates corresponding RP-set information after receiving all these BSMFs. Because the RP-set information contained in each segment is different, loss of some IP fragments will not result in dropping of the entire message. Generally, a BSR performs BSM semantic fragmentation according to the MTU of its BSR interface. However, the semantic fragmentation of BSMs originated because of learning of a new IPv6 PIM neighbor is performed according to the MTU of the outgoing interface. The function of BSM semantic fragmentation is enabled by default. Devices not supporting this function might deem a fragment as an entire message and learn only part of the RP-set information. Therefore, if such devices exist in the IPv6 PIM-SM domain, you need to disable the semantic fragmentation function on the C-BSRs. To disable the BSM semantic fragmentation function: 308
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