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Artikel nummerCISS45ESK912253SG
Producent Cisco Systems
Part nummer S45ESK9-12253SG=
Omschrijving CAT4500 IOS Enterprise Services SSHEN CATX EN
  CAT4500 IOS Enterprise Services SS
Gewicht 0,09 (kg)
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Catalogus verwijzingen:
CISCO Catalyst 4000 Series Software

Product specificaties ***
Omschrijving IOS Software 12.2(53)SG for the Cisco Catalyst 4500 Supervisor Engines IV/V/V-10GE (Enterprise Services image with 3DES/BGP)
Cisco IOS Software Release 12.2(53)SG
With the typical topology (hub and spoke) in a campus environment, where the wiring closets (spokes) are connected to the distribution switch (hub) forwarding all nonlocal traffic to the distribution layer, the wiring closet switch need not hold a complete routing table. A best practice design, where the distribution switch sends a default route to the wiring closet switch to reach interarea and external routes (OSPF stub or totally stubby areas configuration), should be used when OSPF for routed access is used in the wiring closet.

With Cisco IOS Software Release 12.2(53)SG, the IP Base image supports OSPF for routed access. The Enterprise Services image is required if you need multiple OSPFv2 and OSPFv3 instances without route restrictions. Additionally, Enterprise Services is required to enable the VRF-lite feature.

If two or more equal-cost paths from a source are available, unicast traffic will be load split across those paths. However, by default, multicast traffic is not load split across multiple equal-cost paths. In general, multicast traffic flows down from the reverse path forwarding (RPF) neighbor. According to PIM specifications, this neighbor must have the highest IP address if more than one neighbor has the same metric.

In Cisco IOS Software Release 12.2(53)SG, the ip multicast multipath command can be used with the s-g-hash and next-hop-based keywords to enable ECMP multicast load splitting based on source, group, and next-hop address. The next-hop-based keyword enables a more complex hash, the next-hop-based S-G-hash algorithm, which is based on source, group, and next-hop address. The next-hop-based S-G-hash algorithm is predictable because no randomization is used in calculating the hash value. Unlike the S-hash and basic S-G-hash algorithms, the hash mechanism used by the next-hop-based S-G-hash algorithm is not subject to polarization.
Technische details Platform Catalyst 4500
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