02-10-2011 11:49 PM - edited 03-06-2019 03:29 PM
Hi every one,
i have some doubts in basic stuffs.
Q1: What are the differences between serial interface and ethernet interfaces.
Q2: Can we use ethernet interfaces to terminate WAN connectivity just like serial.Why always we are using serial interfaces to connect the WAN.
Please help me out by answering these questions.
!!!!THANKS IN ADVANCE!!!!!
Solved! Go to Solution.
02-16-2011 04:22 AM
Hi ,
Fast Ethernet is one of the option for any speed above T1/E1 , other TDM options which can be offered are DS-3 and STM1 which can be offered on sub-rated basis as well. For example you can subscribe for 10 MB BW on 45 MB Access .
The answer for your second question , is that there could be a possibility that you have subscribed for L2 VPN (EVPL or VPLS ) or L3 VPN (MPLS ) .
L2 VPN woks on VLAN tags and L3 VPN termiantes on a L3 device.
regards
Navin Parwal
02-11-2011 12:00 AM
Hi,
Serial interfaces are used by ISP to provide WAN connections as a frame relay, T1, T3, etc. The port used is V.35 or RS232.
Ethernet interfaces are used in LAN and WAN connections (RJ45). Recently I´ve changed two serial lines by 2 ethernet lines. I think these lines can offer better performance. Apart of this, in my country, month quota is cheaper than Serial line.
regards,
02-11-2011 12:10 AM
Thanks Javi for your reply as a first person.And so only ISP will use serial interfaces for providing WAN connections.But we are using serial interfaces of our routers for connecting WAN at the same time some locations we are using ethernet interfaces for WAN.so what difference it will make.Please elaborate.....
02-15-2011 06:48 PM
Hi ,
Serial Interface is generally based on TDM and for any speed which are less than T1/E1 , it genenally works out to be feasible to go for TDM links in which the termination is done on V.35 or G.703 interface .
For higher speed links it is generally feasible to go for Fast Ethernet Links .
It is very country and Telco specific , in certain developing coutnries , you may not find the infrastructure for Fast Ethernet , hence E1 may be the only option.
There are some differences on the capabilities for these two interfaces , some differences which I can briefly highlight are Dynamic BW is easily provided on TDM as compared to Fast Etherent .
Fast Etherent is highly and easily scalable upto 100 MB , after which you require Gig Ethernet Access .
regards
02-15-2011 08:49 PM
Hi There,
Good explanation by Navin.
On top of that, Serials are by nature flexible and it can be comfortably devided like per customer or provider needs from T1 or E1 connection.
So the Bandwidth allowed to have physical pipe can be clearly configured and adjusted because of TDM structure each T1 or E1 is multiples of 64 kbps slots ( example :- 64 x 32 fpr E1 which 2048 Kbps or 2 Mb circuit) same follow for T1. This is good to have exactly what we run when designing Layer 3 Routing, so Routing protocols can take Routing decisions based on Bandwidth provisioned automatically or adjust with Policy based Routing.
When it comes to FastEthernet the original build was for LAN connectivity. Of course we can use for MAN or WAN because of multilayer aware of transmissions capability is already rocking in Market. Because of Switching and Routing enhancements ( merge ) and many devices are aware of Layer 2 to 7 traffic patterns in many vendors. So it is difficult to clearly define the scope for these two types these days.
Hope you got some clarification !
Happy Reading
02-16-2011 03:23 AM
Hi Ganga & Navin,
Thanks for your reply on this.i got some knowledge by reading your answers.so if we are connecting the WAN or MAN link with the bandwidth more capacity more than T1 and E1 speed,fast ethernet is a only option..my understanding from your reply
One more question,
In my company,we have got 20Mb N-mpls links and in some locations we have terminated the links on router Fe interface and in some locations we have terminated in switch FE interface.what differece it will make? Can some one share their idea please?
02-16-2011 04:22 AM
Hi ,
Fast Ethernet is one of the option for any speed above T1/E1 , other TDM options which can be offered are DS-3 and STM1 which can be offered on sub-rated basis as well. For example you can subscribe for 10 MB BW on 45 MB Access .
The answer for your second question , is that there could be a possibility that you have subscribed for L2 VPN (EVPL or VPLS ) or L3 VPN (MPLS ) .
L2 VPN woks on VLAN tags and L3 VPN termiantes on a L3 device.
regards
Navin Parwal
02-21-2011 11:58 PM
Eventually i understood the diff...Thanks guys...
02-22-2011 04:03 AM
That's good
03-09-2020 11:13 AM
03-30-2017 05:19 AM
Serial interface is totally different from Ethernet. You may share or convert your serial device to Ethernet network with the software - https://www.eltima.com/serial-ethernet-converter/
Or use the hardware converter like Perl or smth.
05-08-2020 02:47 AM
When we change the link from Serial to Ethernet, Can same Crypto map config use ?
Hi , We have a serial link with Crypto configured.
Not Telcom wants to change the interface to Etherenet.
There is G0/0 interface . They said new link is MPLS.
Diginet to EThernet .
Please advise about crypto config . can I use the same Crypto
Current Int
interface Serial0/1/1
description 128k MediaRing/NTT MPLS
ip address
ip access-group 101 in
no ip redirects
no ip unreachables
no ip proxy-arp
ip flow ingress
encapsulation ppp
load-interval 30
crypto map Crypto-map
- Can we use below config for Etherenet
interface GigabitEthernet0/0
description ## CONNECTED TO MPLS ##
ip address
ip access-group 101 in
no ip redirects
no ip unreachables
no ip proxy-arp
ip flow ingress
ip flow egress
load-interval 30
duplex full
speed 1000
crypto map Crypto-map
03-16-2021 05:02 PM
thanks!! ,one question , I want to simulate in GNS3 the interface 10GE (as i used to see in my work:
TenGigE0/5/1/2 is up, line protocol is up
Interface state transitions: 129
Hardware is TenGigE, address is 40ce.2452.8b06 (bia 40ce.2452.8b06) ).
For that i choose GigabitEthernet but i think that the only way can be changing the speed ?
Discover and save your favorite ideas. Come back to expert answers, step-by-step guides, recent topics, and more.
New here? Get started with these tips. How to use Community New member guide