11-05-2007 09:53 AM - edited 03-03-2019 05:40 AM
Hi!
i have a couples of questions:
Frame-relay
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1)where/when we use like this map in frame-relay:
frame-relay map ip 12.12.34.6 dlci (to remote peer)
frame-relay map ip 12.12.34.5(map to router it self)
Switching
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1)where/when WE USE Like this config.and what it does?
Mls qos
ont f0/0
mpls qos COS 1
2)where/when WE USE Like this config.and what it does?
Remote-span
3)where/when WE USE Like this config.and what it does?
Spaning-tree vlan 10 forward-delay 12
10xs
Ali
NOTE:UR BREIF EXPLANATION ITSVERY MUCH APPRECIATED
11-05-2007 10:20 AM
Response to Frame Relay question No.1:
You may map an IP address to a specific PVC (DLCI) when dynamic mapping via inverse-arp can't work. Mapping to the router itself is a nonsense.
Remember that by default any frame-relay interface is point-to-multipoint.
Example 1:
There's no LMI therefore there's no automatic DLCI learning. With static mapping is no need of inverse-arp.
interface serial 0
ip address 12.12.34.5 255.255.255.252
encapsulation frame-relay
frame-relay map ip 12.12.34.6 dlci 123
no keepalive
Example 2:
There's no LMI but the DLCI is static declared. The mapping will occur dynamically via inverse-arp if the other end of the PVC will fit in the same subnet.
interface serial 0
ip address 12.12.34.5 255.255.255.252
encapsulation frame-relay
frame-relay interface-dlci 123
no keepalive
Example 3:
There is LMI running and dynamic mapping via inverse-arp.
interface serial 0
ip address 12.12.34.5 255.255.255.252
encapsulation frame-relay
Use the command "show frame-relay map" to observe the PVC mappings. Remember that IP protocol only can be mapped dynamically with inverse-arp.
11-05-2007 10:32 AM
Frame-relay
1. DLCI identifies each link / channel uniquely. If 2 sites A & B are connected by frame-relay, A & B have different DLCI No's.
The command mentioned maps remote peer to a local link identifier. e.g. On rtr A, ip add wud be tht of rtr B, while DLCI is the one configured on link of rtr A.
Switching
2. When ur sniffing a switchport & capturing a output, the concept is known as SPAN. Here, ur source & destination ports shud be on same switch. In RSPAN or Remote-span, sniffing is done across switches i.e. sorce port will be on 1 switch while destination on other.
3. By this command, u can reduce the time taken by a trunkport to transition to forwarding state. By default it is 50 sec. With the command mentioned, it wud take 12 sec for each state i.e. listenign, learning & fwding. So, the port wud transition to fwd state in just 36 sec instead of 50.
11-06-2007 03:38 AM
Hello
10xs for ur reply,but i diddn't understand why the router has map to it self to to its ip address too
10xs
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