If i understand correctly, "clns-mtu" value is used by both CLNS and IS-IS. For CLNS, this is used to determine the maximum sized network layer PDU that can be sent over that interface (this includes payload and L3 header). PDUs which are larger will be segmented (ISO speak for fragmentation) to clns-mtu size.
For IS-IS, clns-mtu has both a direct and indirect usage.
Directly, clns-mtu controls the maximum size PDU IS-IS will send on that interface. This directly affects the size of IIHs if hello padding is enabled (which is the default setting).
Indirectly, clns-mtu needs to be greater than or equal to the maximum size LSP that any IS in the area/domain may generate. So clns-mtu must be>= lsp-mtu for all links in the rea/domain which are used forflooding of LSPs."
Now, in IOS XR, you can't change the clns mtu, but you can change the lsp mtu. Unlike IOS, where you can change the clns mtu. The clns mtu will affect the hello packets, and the lsp mtu will not so that is a difference. So you can keep using the clns mtu on the IOS router.
The 'lsp-mtu' option in the IS-IS configuration now affects the size of CSN(Complete Sequence Number) and PSN (Partial Sequence Number) PDUs. The size of these PDUs will be limited to the value specified by 'lsp-mtu'. If 'lsp-mtu'is set to a value larger than the CLNS MTU of an interface running IS-IS, the CLNS MTU will be used instead.
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The Cisco EPN system incorporates a network architecture designed to consolidate multiples services on a single Multiprotocol Label Switching (MPLS) transport network. This network is designed primarily based on...
Internet security is important with the increasing attacks that are happening every day. Many internet and browsing security solutions exist, but some are not very easy to use or maybe the question is how can I enable them?