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ISIS & OSPF

Created: Jan 23, 2019 06:58:20Latest reply: Jan 23, 2019 13:52:28 1355 4 0 0 0
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Hello all,

what is the reason that make ISIS still used however OSPF doing the same functions ?

Does anyone know? Thanks!

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chenhui
Admin Created Jan 23, 2019 07:16:19

@Amr_Fayrouz_Elattar hi,
in a simple word, ISIS has a better expansibility than OSPF does, for example, isis can support ipv6 while OSPF doesn't, if we want the OSPF support ipv6, we have to enable OSPF v3, rather than OSPF.
what's more, isis can bear a larger scale network topology and devices than OSPF, this is quite important in ISP network environment, ISP contains a lot of devices usually.
besides, isis works on data link layer, OSPF is based on IP which works on network layer, this advantage gives more expansibility to isis than OSPF.

Glad to help you! Any further questions, let us know.

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Jessica_Tian
Jessica_Tian Created Jan 23, 2019 07:01:27

sorry, not very understand。。。
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chenhui
chenhui Admin Created Jan 23, 2019 07:16:19

@Amr_Fayrouz_Elattar hi,
in a simple word, ISIS has a better expansibility than OSPF does, for example, isis can support ipv6 while OSPF doesn't, if we want the OSPF support ipv6, we have to enable OSPF v3, rather than OSPF.
what's more, isis can bear a larger scale network topology and devices than OSPF, this is quite important in ISP network environment, ISP contains a lot of devices usually.
besides, isis works on data link layer, OSPF is based on IP which works on network layer, this advantage gives more expansibility to isis than OSPF.

Glad to help you! Any further questions, let us know.

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chenhui
chenhui Admin Created Jan 23, 2019 07:26:33

by the way, since we have gotten used to using IP network, isis seems more complex than ospf.
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MHME
MHME Created Jan 23, 2019 13:52:28

Both IS-IS and Open Shortest Path First (OSPF) are link state protocols, and both use the same Dijkstra algorithm for computing the best path through the network. As a result, they are conceptually similar. Both support variable length subnet masks, can use multicast to discover neighboring routers using hello packets, and can support authentication of routing updates.

IS-IS differs from OSPF in the way that "areas" are defined and routed between. IS-IS routers are designated as being: Level 1 (intra-area); Level 2 (inter area); or Level 1–2 (both). Routing information is exchanged between Level 1 routers and other Level 1 routers of the same area, and Level 2 routers can only form relationships and exchange information with other Level 2 routers. Level 1–2 routers exchange information with both levels and are used to connect the inter area routers with the intra area routers.
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