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Does MTU have to match?
You must ensure your MTU matches on both sides of an ethernet link; you should not have mismatched mtu values anywhere in the same ethernet broadcast domain. Note that the ethernet headers are not included in the MTU you are setting. Large incoming packets may be dropped based on the interface MTU size.
Why MTU should match in OSPF?
The real fix to this problem is to ensure that the MTU values match between neighbors, which prevents both routing exchange in the control plane, and packet drops due to unsupported sizes in the data plane.
What is the maximum hop count for link state protocols?
Distance Vector and Link State Routing Protocols
| Table 2-2. Distance Vector Protocol Summary | |
|---|---|
| Characteristic | Description |
| Count to infinity | This is the maximum hop count. For RIP, it is 15 and for IGRP, it is 255. |
| Algorithm | One algorithm example is Bellman-Ford for RIP. |
Which protocols use bandwidth to calculation metric?
Each routing protocol has its own way to calculate the metric; Routing Information Protocol (RIP) uses hop counts, OSPF uses a parameter called cost, EIGRP uses bandwidth and the delay to compute the metrics, etc.
Is BGP link-state protocol?
BGP is a path vector routing protocol and does not contain a complete topology of the network-like link state routing protocols.
When do data link MTUs need to match?
On other switch to switch / switch to router links, the data-link MTU must be at least large enough for your server MTUs + any other services added by your routers (such as IPSec, MPLS, etc…). By way of example, if your transit switched MTUs are not large enough it can cause strange issues getting network file systems to work correctly.
Can anybody Finaly explain ” system MTU routing?
If I have one router with interfaces supported only MTU 1500 (c2600) and second router with MTU up to 9000 (c7200), how can I configure the switch c3560 in between, speaking OSPF with both of them? The command “ip ospf mtu-ignore” doesn help here. Thank you! Solved! Go to Solution. 01-18-2014 06:38 AM 01-18-2014 06:38 AM
Do you have to match the MTUs of your router?
On router to router links The routers’ data-link MTUs should match your other routers, or you could wind up with strange IGP peering problems. The IP MTU on routed interfaces should be the same size as your server’s IP MTUs that must transit them.
Where do you get the MTU of a port?
ALL ports including the SVIs get their MTU value from the “system mtu” command. “system mtu routing” value CANNOT have a greater value than the “sytem mtu” value. This means that in case you have system mtu = 1516, you cannot set system routing as 1518 unless you increase the system mtu value to 1518 or higher.