PPP and Metro Ethernet

Point-to-Point (PPP) is a point to point encapsulation protocol across dedicated or circuit switching across WAN network, along with protocol such as HDLC SDLC, and ISDN. Below would be a basic configuration for PPP in Cisco configuration terminal.

1. Config
   1. Interface
      1. Encapsulation ppp/hdlc
      2. Ppp authentication chap
      3. #Ppp authentication pap
      4. #Ppp pap sent-username r1 password pass1
   2. Hostname r1
   3. Username r2 password mypass
2. Show ppp all
3. Config multilink
   1. Interface multilink 1
      1. Encapsulation ppp
      2. Ppp multilink
      3. Ip addresss 11111 11111
      4. Ppp multilink group 1
   2. Interface serial0/0/0
      1. Encapsulation ppp
      2. Ppp multilink
      3. No ip address
      4. Ppp multilink group 1
   3. Show ip route
   4. Show ip eigrp interface
   5. Show ip int br
   6. Show interface multilink1
      1. Interface state, mutilink open
   7. Show ppp multillink
      1. Member linnk number
      2. Interfaces
      3. Inactive member
   8. Keepalive feature helps a router notice when a link is no longer functioning.
   9. Debug ppp authentification

       

Metro Ethernet

1. PoP Point of presnese – service provicer locally proximate office.
2. Carrier ethernet – ethernet WAN service provider by a carrier also called metro ether.
3. IEEE Ethernet Standard useful for metro ethernet access

1. Route redistribution – taking routes from one routing protocol process and injecting them into another.
   1. MPLS does this between PE router using variation of Multiprotocol BGP (MPBGP)
   2. EIGRP in MPLS
      1. A CE router does become neighbors with the PE router on the othe end of the access link.
      2. A CE router does not become neighbors with toher CE routers.
      3. The MPLS network will advertise the customer’s routes between the various PE routers, so that the CE routers can learn all customer routes through their PE-CE routing protocol neighbor relationship.
   3. OSPF
      1. The MPLS Pes form a backbone area by the name of a super backbone..
      2. Each PE-CE link can be any area, a non-backbone area or the backnone area.