Skip navigation
Cisco Learning Home > Certifications > Routing & Switching (CCNP) > Discussions

_Communities

This Question is Answered
1685 Views 4 Replies Latest reply: Nov 29, 2011 10:55 AM by Brian McGahan - 4 x CCIE, CCDE RSS

Currently Being Moderated

L route on IPv6 table?

Nov 28, 2011 2:08 PM

ry 200 posts since
Jun 22, 2010

Can someone clarify the L route on IPv6, which does not appear in IPv4. At least not on the IOS that I use.

  • Martin 13,075 posts since
    Jan 16, 2009
    Currently Being Moderated
    1. Nov 28, 2011 2:28 PM (in response to ry)
    Re: L route on IPv6 table?

    Local IPv6 routes concept exists only in IPv6, not IPv4.

    There are 3 types of IPv6 addresses; Global, Local, anycast; and one interface may have all 3 IPv6 addresses.

    You do not have to assign Local IPv6 address, it already assign by router using

    FE80 /10 prefix and MAC address.

     

    Keith has good videos on IPv6....

     

    link is https://learningnetwork.cisco.com/thread/36527

  • Brian McGahan - 4 x CCIE, CCDE 642 posts since
    May 29, 2008
    Currently Being Moderated
    2. Nov 28, 2011 2:39 PM (in response to ry)
    Re: L route on IPv6 table?

    A local route with code L is just the address that the router is listening for.  Some versions show this for both IPv4 and IPv6.

     

    R1#show ip route
    Codes: L - local, C - connected, S - static, R - RIP, M - mobile, B - BGP
           D - EIGRP, EX - EIGRP external, O - OSPF, IA - OSPF inter area 
           N1 - OSPF NSSA external type 1, N2 - OSPF NSSA external type 2
           E1 - OSPF external type 1, E2 - OSPF external type 2
           i - IS-IS, su - IS-IS summary, L1 - IS-IS level-1, L2 - IS-IS level-2
           ia - IS-IS inter area, * - candidate default, U - per-user static route
           o - ODR, P - periodic downloaded static route, H - NHRP
           + - replicated route, % - next hop override
    
    Gateway of last resort is not set
    
          1.0.0.0/32 is subnetted, 1 subnets
    C        1.1.1.1 is directly connected, Loopback0
          10.0.0.0/8 is variably subnetted, 2 subnets, 2 masks
    C        10.0.0.0/24 is directly connected, FastEthernet1/0
    L        10.0.0.1/32 is directly connected, FastEthernet1/0
    
    R1#show ipv6 route
    IPv6 Routing Table - default - 3 entries
    Codes: C - Connected, L - Local, S - Static, U - Per-user Static route
           B - BGP, R - RIP, I1 - ISIS L1, I2 - ISIS L2
           IA - ISIS interarea, IS - ISIS summary, D - EIGRP, EX - EIGRP external
           ND - Neighbor Discovery
           O - OSPF Intra, OI - OSPF Inter, OE1 - OSPF ext 1, OE2 - OSPF ext 2
           ON1 - OSPF NSSA ext 1, ON2 - OSPF NSSA ext 2
    C   2001::/64 [0/0]
         via FastEthernet1/0, directly connected
    L   2001::1/128 [0/0]
         via FastEthernet1/0, receive
    L   FF00::/8 [0/0]
         via Null0, receive
    R1#show run int f1/0
    Building configuration...
    
    Current configuration : 138 bytes
    !
    interface FastEthernet1/0
     ip address 10.0.0.1 255.255.255.0
     ip ospf network point-to-point
     duplex full
     ipv6 address 2001::1/64
    end
    

     

    The IPv4 local route is 10.0.0.1/32, while the IPv6 local route is 2001::1/128.  It just means that if the router sees a packet going to either of those addresses, the packet is for the router itself.

     

    A Link-Local (FE80::/8) address in IPv6 is a different concept than this.

  • Brian McGahan - 4 x CCIE, CCDE 642 posts since
    May 29, 2008
    Currently Being Moderated
    4. Nov 29, 2011 10:55 AM (in response to ry)
    Re: L route on IPv6 table?

    Newer versions of IOS show you the IP address assigned to the interface as a Local route in the routing table.  It doesn't change the behavior of anything, it just makes it easier to see what address the interface has assigned.  Previously you had to look at both the "show ip route" to see what the network assigned was, and then the "show ip interface brief" to see what the actual host address was.  The local route in the table shows you both at the same time.

Actions

More Like This

  • Retrieving data ...

Bookmarked By (0)