Hi,
I just finished Lab 6 (ISIS) and found a few differences in the DSG and I
would like to hear your opinions.
Task 6.7
Create two Loopback interfaces on R9. Interface Loopback1 (10.6.0.6/24) and
Interface Loopback2
(10.6.1.6/24). Summarize these two IP subnets into one and advertise it
through IS-IS level 1 and level 2
routers. Make sure that the advertisements of the Loopbacks do not waste CPU
cycles by trying to form
unnecessary adjacencies.
After configuring the loopbacks on R9, they need to be redistributed into
ISIS before a
summary will be advertised. For the summary, the first two octets are the
same, and the
third differs only on the last bit, so a 23 bit summary will cover both
networks. When
redistributing into a routing protocol, creating a route-map allows you to
be granular
regarding which networks you want to bring to that protocol.
R9(config)#int loop1
R9(config-if)#ip address 10.6.0.6 255.255.255.0
R9(config-if)#int loop2
R9(config-if)#ip address 10.6.1.6 255.255.255.0
R9(config)#access-list 77 permit 10.6.0.0 0.0.1.0
R9(config)#route-map CONN
R9(config-route-map)#match ip address 77
R9(config-route-map)#router isis
R9(config-router)#redist conn route-map CONN level-1-2
R9(config-router)#summary-address 10.6.0.0 255.255.254.0 level-1-2
I have not used the route-map and still got the summary address in the
routing table of other routers
This is all what I did: summary-address 10.6.0.0 255.255.254.0 level-1-2
Task 6.8
Create 2 static routes on R9: 192.6.6.0 255.255.255.0 to null0 and 192.7.7.0
255.255.255.0 to null0.
Redistribute both static routes into the IS-IS process, but do not advertise
the 192.7.7.0/24 subnet to any
other routers.
Here, we have 2 static routes to redistribute into ISIS on R9. Here, we need
to redistribute
both routes into ISIS, but only advertise one to the other routers. By
setting the metric for
the second route to the maximum value, it will not appear on the other
routers.
R9(config)#ip route 192.6.6.0 255.255.255.0 null0
R9(config)#ip route 192.7.7.0 255.255.255.0 null0
R9(config)#access-list 86 permit 192.6.6.0
R9(config)#access-list 87 permit 192.7.7.0
R9(config)#route-map 192s permit 10
R9(config-route-map)#match ip address 86
R9(config-route-map)#route-map 192s permit 20
R9(config-route-map)#match ip address 87
R9(config-route-map)#set metric 4294967295
R9(config)#router isis
R9(config-router)#redist static ip route-map 192s
I tried with a route-map too but I did not worked (no idea why), this was my
route-map:
standard IP access list REDIS
10 permit 192.7.7.0, wildcard bits 0.0.0.255 (6 matches)
30 deny any (6 matches)
route-map REDIS deny 10
match ip address REDIS
router isis
redistribute static ip route-map REDIS
---------
Then I tried this and it worked but I think that this solution is not
scalable:
router isis
redistribute maximum-prefix 1
redistribute static ip
The other routers have only the 192.6.6.0 subnet in their routing table
(cleared ISIS process, too)
I get this message but it is not a problem:
IPRT-4-REDIST_MAX_PFX: Redistribution prefix limit has been reached "isis
L2" - 1 prefixes
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